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malloc: Simplify __mtag_tag_new_usable

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The chunk cannot be a dumped one here.  The only non-obvious cases
are free and realloc which may be called on a dumped area chunk,
but in both cases it can be verified that tagging is already
avoided for dumped area chunks.

Reviewed-by: DJ Delorie <dj@redhat.com>
This commit is contained in:
Szabolcs Nagy 2021-02-04 11:38:23 +00:00
parent 0ae773bba0
commit 91e5c439d3
1 changed files with 0 additions and 5 deletions
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5
malloc/arena.c
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@ -298,11 +298,6 @@ __mtag_tag_new_usable (void *ptr)
if (ptr) if (ptr)
{ {
mchunkptr cp = mem2chunk(ptr); mchunkptr cp = mem2chunk(ptr);
/* This likely will never happen, but we can't handle retagging
chunks from the dumped main arena. So just return the
existing pointer. */
if (DUMPED_MAIN_ARENA_CHUNK (cp))
return ptr;
ptr = __libc_mtag_tag_region (__libc_mtag_new_tag (ptr), ptr = __libc_mtag_tag_region (__libc_mtag_new_tag (ptr),
CHUNK_AVAILABLE_SIZE (cp) - CHUNK_HDR_SZ); CHUNK_AVAILABLE_SIZE (cp) - CHUNK_HDR_SZ);
} }