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commit 11b451c8868d8a2b0edc5dfd44fc58d9ee538be0
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Author: Mark Wielaard <mark@klomp.org>
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Date: Wed May 15 17:14:01 2019 +0200
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dlfcn: Guard __dlerror_main_freeres with __libc_once_get (once) [BZ# 24476]
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dlerror.c (__dlerror_main_freeres) will try to free resources which only
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have been initialized when init () has been called. That function is
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called when resources are needed using __libc_once (once, init) where
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once is a __libc_once_define (static, once) in the dlerror.c file.
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Trying to free those resources if init () hasn't been called will
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produce errors under valgrind memcheck. So guard the freeing of those
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resources using __libc_once_get (once) and make sure we have a valid
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key. Also add a similar guard to __dlerror ().
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* dlfcn/dlerror.c (__dlerror_main_freeres): Guard using
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__libc_once_get (once) and static_bug == NULL.
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(__dlerror): Check we have a valid key, set result to static_buf
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otherwise.
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Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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diff --git a/dlfcn/dlerror.c b/dlfcn/dlerror.c
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index 96bf92533335036b..06732460ea1512cd 100644
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--- a/dlfcn/dlerror.c
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+++ b/dlfcn/dlerror.c
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@@ -72,9 +72,16 @@ __dlerror (void)
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__libc_once (once, init);
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/* Get error string. */
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- result = (struct dl_action_result *) __libc_getspecific (key);
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- if (result == NULL)
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- result = &last_result;
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+ if (static_buf != NULL)
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+ result = static_buf;
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+ else
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+ {
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+ /* init () has been run and we don't use the static buffer.
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+ So we have a valid key. */
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+ result = (struct dl_action_result *) __libc_getspecific (key);
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+ if (result == NULL)
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+ result = &last_result;
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+ }
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/* Test whether we already returned the string. */
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if (result->returned != 0)
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@@ -230,13 +237,19 @@ free_key_mem (void *mem)
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void
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__dlerror_main_freeres (void)
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{
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- void *mem;
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/* Free the global memory if used. */
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check_free (&last_result);
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- /* Free the TSD memory if used. */
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- mem = __libc_getspecific (key);
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- if (mem != NULL)
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- free_key_mem (mem);
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+
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+ if (__libc_once_get (once) && static_buf == NULL)
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+ {
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+ /* init () has been run and we don't use the static buffer.
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+ So we have a valid key. */
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+ void *mem;
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+ /* Free the TSD memory if used. */
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+ mem = __libc_getspecific (key);
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+ if (mem != NULL)
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+ free_key_mem (mem);
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+ }
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}
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struct dlfcn_hook *_dlfcn_hook __attribute__((nocommon));
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