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malloc: Print error when oldsize is not equal to the current size.

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This is used to detect errors early.  The read of the oldsize is
not protected by any lock, so check this value to avoid causing
bigger mistakes.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Qingqing Li 2022-09-22 15:32:56 -04:00 committed by DJ Delorie
parent de477abcaa
commit 774d43f27d
1 changed files with 2 additions and 1 deletions
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3
malloc/malloc.c
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@ -4803,7 +4803,8 @@ _int_realloc (mstate av, mchunkptr oldp, INTERNAL_SIZE_T oldsize,
/* oldmem size */ /* oldmem size */
if (__builtin_expect (chunksize_nomask (oldp) <= CHUNK_HDR_SZ, 0) if (__builtin_expect (chunksize_nomask (oldp) <= CHUNK_HDR_SZ, 0)
|| __builtin_expect (oldsize >= av->system_mem, 0)) || __builtin_expect (oldsize >= av->system_mem, 0)
|| __builtin_expect (oldsize != chunksize (oldp), 0))
malloc_printerr ("realloc(): invalid old size"); malloc_printerr ("realloc(): invalid old size");
check_inuse_chunk (av, oldp); check_inuse_chunk (av, oldp);