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| author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-12-29 17:12:21 -0300 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2020-12-30 10:37:58 -0300 |
| commit | 9835632cf43fd6d1f8b8f40a88892a45b6bfad6e (patch) | |
| tree | e405c3d62988b2a6ccd63db757d890cf5c80a901 | |
| parent | 38a033ac85d62c64a2fc81b06c0acffcd4a113f5 (diff) | |
| download | glibc-9835632cf43fd6d1f8b8f40a88892a45b6bfad6e.zip glibc-9835632cf43fd6d1f8b8f40a88892a45b6bfad6e.tar.gz glibc-9835632cf43fd6d1f8b8f40a88892a45b6bfad6e.tar.bz2 | |
malloc: preserve errno on mcheck hooks [BZ #17924]
Similar to the fix 69fda43b8d, save and restore errno for the hook
functions used for MALLOC_CHECK_=3.
It fixes the malloc/tst-free-errno-mcheck regression.
Checked on x86_64-linux-gnu.
| -rw-r--r-- | malloc/hooks.c | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/malloc/hooks.c b/malloc/hooks.c index 6474ba8..fc285f1 100644 --- a/malloc/hooks.c +++ b/malloc/hooks.c @@ -260,6 +260,8 @@ free_check (void *mem, const void *caller) if (!mem) return; + int err = errno; + #ifdef USE_MTAG /* Quickly check that the freed pointer matches the tag for the memory. This gives a useful double-free detection. */ @@ -274,12 +276,16 @@ free_check (void *mem, const void *caller) { __libc_lock_unlock (main_arena.mutex); munmap_chunk (p); - return; } - /* Mark the chunk as belonging to the library again. */ - (void)TAG_REGION (chunk2rawmem (p), CHUNK_AVAILABLE_SIZE (p) - CHUNK_HDR_SZ); - _int_free (&main_arena, p, 1); - __libc_lock_unlock (main_arena.mutex); + else + { + /* Mark the chunk as belonging to the library again. */ + (void)TAG_REGION (chunk2rawmem (p), CHUNK_AVAILABLE_SIZE (p) + - CHUNK_HDR_SZ); + _int_free (&main_arena, p, 1); + __libc_lock_unlock (main_arena.mutex); + } + __set_errno (err); } static void * |