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malloc: Use different tag after mremap

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The comment explained why different tag is used after mremap, but
for that correctly tagged pointer should be passed to tag_new_usable.
Use chunk2mem to get the tag.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Szabolcs Nagy
2021-03-12 09:46:15 +00:00
parent faf003ed8d
commit 14652f60a4
1 changed files with 1 additions and 1 deletions
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malloc/malloc.c
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@ -3411,7 +3411,7 @@ __libc_realloc (void *oldmem, size_t bytes)
newp = mremap_chunk (oldp, nb); newp = mremap_chunk (oldp, nb);
if (newp) if (newp)
{ {
void *newmem = chunk2rawmem (newp); void *newmem = chunk2mem (newp);
/* Give the new block a different tag. This helps to ensure /* Give the new block a different tag. This helps to ensure
that stale handles to the previous mapping are not that stale handles to the previous mapping are not
reused. There's a performance hit for both us and the reused. There's a performance hit for both us and the