slab: don't put freepointer outside of object if only orig_size

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The commit 946fa0dbf2 ("mm/slub: extend redzone check to extra
allocated kmalloc space than requested") will extend right redzone
when allocating for orig_size < object_size. So we can't overlay the
freepointer in the object space in this case.

But the code looks like it forgot to check SLAB_RED_ZONE, since there
won't be extended right redzone if only orig_size enabled.

As we are here, make this complex conditional expressions a little
prettier and add some comments about extending right redzone when
slub_debug_orig_size() enabled.

Reviewed-by: Feng Tang <feng.tang@intel.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Chengming Zhou <chengming.zhou@linux.dev>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>

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This commit is contained in:

Chengming Zhou 2024-06-07 16:40:13 +08:00 • committed by Vlastimil Babka

parent 47d911b02c

commit adef2aeaa2

1 changed files with 6 additions and 5 deletions

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mm/slub.c

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