From c0d6740c1219f23f0b9a996f02c1ae9cf824b0b3 Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Thu, 6 Dec 2018 17:12:28 +0000
Subject: [PATCH 03/15] qcow2: Fix Coverity warning when calculating the
refcount cache size
RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <20181206171240.5674-4-kwolf@redhat.com>
Patchwork-id: 83295
O-Subject: [RHEL-8.0 qemu-kvm PATCH 03/15] qcow2: Fix Coverity warning when calculating the refcount cache size
Bugzilla: 1656507
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: John Snow <jsnow@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
From: Alberto Garcia <berto@igalia.com>
MIN_REFCOUNT_CACHE_SIZE is 4 and the cluster size is guaranteed to be
at most 2MB, so the minimum refcount cache size (in bytes) is always
going to fit in a 32-bit integer.
Coverity doesn't know that, and since we're storing the result in a
uint64_t (*refcount_cache_size) it thinks that we need the 64 bits and
that we probably want to do a 64-bit multiplication to prevent the
result from being truncated.
This is a false positive in this case, but it's a fair warning.
We could do a 64-bit multiplication to get rid of it, but since we
know that a 32-bit variable is enough to store this value let's simply
reuse min_refcount_cache, make it a normal int and stop doing casts.
Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit 7af5eea9b34ffb7a9a9fc25ba71998a02b76e159)
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
block/qcow2.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/block/qcow2.c b/block/qcow2.c
index 4b65e4c..a0f7234 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -775,6 +775,7 @@ static void read_cache_sizes(BlockDriverState *bs, QemuOpts *opts,
BDRVQcow2State *s = bs->opaque;
uint64_t combined_cache_size;
bool l2_cache_size_set, refcount_cache_size_set, combined_cache_size_set;
+ int min_refcount_cache = MIN_REFCOUNT_CACHE_SIZE * s->cluster_size;
combined_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_CACHE_SIZE);
l2_cache_size_set = qemu_opt_get(opts, QCOW2_OPT_L2_CACHE_SIZE);
@@ -811,8 +812,6 @@ static void read_cache_sizes(BlockDriverState *bs, QemuOpts *opts,
} else {
uint64_t virtual_disk_size = bs->total_sectors * BDRV_SECTOR_SIZE;
uint64_t max_l2_cache = virtual_disk_size / (s->cluster_size / 8);
- uint64_t min_refcount_cache =
- (uint64_t) MIN_REFCOUNT_CACHE_SIZE * s->cluster_size;
/* Assign as much memory as possible to the L2 cache, and
* use the remainder for the refcount cache */
@@ -832,7 +831,7 @@ static void read_cache_sizes(BlockDriverState *bs, QemuOpts *opts,
* s->cluster_size);
}
if (!refcount_cache_size_set) {
- *refcount_cache_size = MIN_REFCOUNT_CACHE_SIZE * s->cluster_size;
+ *refcount_cache_size = min_refcount_cache;
}
}
--
1.8.3.1