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7c0489 |
commit 16554464bcd9d77b07c6ff419dc54f00e394fa50
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7c0489 |
Author: DJ Delorie <dj@redhat.com>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
Date: Tue Dec 3 17:44:36 2019 -0500
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7c0489 |
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7c0489 |
Correct range checking in mallopt/mxfast/tcache [BZ #25194]
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7c0489 |
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7c0489 |
do_set_tcache_max, do_set_mxfast:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
Fix two instances of comparing "size_t < 0"
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
Both cases have upper limit, so the "negative value" case
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
is already handled via overflow semantics.
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7c0489 |
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7c0489 |
do_set_tcache_max, do_set_tcache_count:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
Fix return value on error. Note: currently not used.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
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7c0489 |
mallopt:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
pass return value of helper functions to user. Behavior should
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
only be actually changed for mxfast, where we restore the old
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
(pre-tunables) behavior.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
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7c0489 |
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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7c0489 |
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7c0489 |
diff --git a/malloc/malloc.c b/malloc/malloc.c
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
index 90825b2aaed53761..00a37f218c0ab3b2 100644
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
--- a/malloc/malloc.c
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7c0489 |
+++ b/malloc/malloc.c
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
@@ -5111,13 +5111,14 @@ static inline int
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7c0489 |
__always_inline
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
do_set_tcache_max (size_t value)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
{
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- if (value >= 0 && value <= MAX_TCACHE_SIZE)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
+ if (value <= MAX_TCACHE_SIZE)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
{
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
LIBC_PROBE (memory_tunable_tcache_max_bytes, 2, value, mp_.tcache_max_bytes);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
mp_.tcache_max_bytes = value;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
mp_.tcache_bins = csize2tidx (request2size(value)) + 1;
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7c0489 |
+ return 1;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- return 1;
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7c0489 |
+ return 0;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
}
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7c0489 |
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7c0489 |
static inline int
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7c0489 |
@@ -5128,8 +5129,9 @@ do_set_tcache_count (size_t value)
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7c0489 |
{
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7c0489 |
LIBC_PROBE (memory_tunable_tcache_count, 2, value, mp_.tcache_count);
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7c0489 |
mp_.tcache_count = value;
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7c0489 |
+ return 1;
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7c0489 |
}
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7c0489 |
- return 1;
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7c0489 |
+ return 0;
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7c0489 |
}
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7c0489 |
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7c0489 |
static inline int
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7c0489 |
@@ -5146,7 +5148,7 @@ static inline int
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7c0489 |
__always_inline
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7c0489 |
do_set_mxfast (size_t value)
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7c0489 |
{
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7c0489 |
- if (value >= 0 && value <= MAX_FAST_SIZE)
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7c0489 |
+ if (value <= MAX_FAST_SIZE)
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7c0489 |
{
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7c0489 |
LIBC_PROBE (memory_mallopt_mxfast, 2, value, get_max_fast ());
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7c0489 |
set_max_fast (value);
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7c0489 |
@@ -5171,18 +5173,24 @@ __libc_mallopt (int param_number, int value)
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7c0489 |
(see definition of set_max_fast). */
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7c0489 |
malloc_consolidate (av);
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7c0489 |
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7c0489 |
+ /* Many of these helper functions take a size_t. We do not worry
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7c0489 |
+ about overflow here, because negative int values will wrap to
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7c0489 |
+ very large size_t values and the helpers have sufficient range
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7c0489 |
+ checking for such conversions. Many of these helpers are also
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7c0489 |
+ used by the tunables macros in arena.c. */
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7c0489 |
+
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7c0489 |
switch (param_number)
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7c0489 |
{
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7c0489 |
case M_MXFAST:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- do_set_mxfast (value);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
+ res = do_set_mxfast (value);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
break;
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7c0489 |
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7c0489 |
case M_TRIM_THRESHOLD:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- do_set_trim_threshold (value);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
+ res = do_set_trim_threshold (value);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
break;
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7c0489 |
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7c0489 |
case M_TOP_PAD:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- do_set_top_pad (value);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
+ res = do_set_top_pad (value);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
break;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
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7c0489 |
case M_MMAP_THRESHOLD:
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
@@ -5190,25 +5198,25 @@ __libc_mallopt (int param_number, int value)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
break;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
case M_MMAP_MAX:
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- do_set_mmaps_max (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
+ res = do_set_mmaps_max (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
break;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
case M_CHECK_ACTION:
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- do_set_mallopt_check (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
+ res = do_set_mallopt_check (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
break;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
case M_PERTURB:
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- do_set_perturb_byte (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
+ res = do_set_perturb_byte (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
break;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
case M_ARENA_TEST:
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
if (value > 0)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- do_set_arena_test (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
+ res = do_set_arena_test (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
break;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
case M_ARENA_MAX:
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
if (value > 0)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
- do_set_arena_max (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
+ res = do_set_arena_max (value);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
break;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
7c0489 |
__libc_lock_unlock (av->mutex);
|