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authorBalasubramani Vivekanandan <balasubramani_vivekanandan@mentor.com>2018-01-31 16:15:43 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2018-01-31 17:18:36 -0800
commit5d682681f8a2bd127748d707243661fcb00f7acb (patch)
treef961fa688cf6f8d6a44f6ed18f3aa5977b09f6f7 /mm/slub.c
parent84ebb5827d015c1045429d018bf9a48f95f082a6 (diff)
mm/slub.c: fix wrong address during slab padding restoration
Start address calculated for slab padding restoration was wrong. Wrong address would point to some section before padding and could cause corruption Link: http://lkml.kernel.org/r/1516604578-4577-1-git-send-email-balasubramani_vivekanandan@mentor.com Signed-off-by: Balasubramani Vivekanandan <balasubramani_vivekanandan@mentor.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slub.c')
-rw-r--r--mm/slub.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/slub.c b/mm/slub.c
index cfd56e5a35fb..733ba32c031b 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -838,6 +838,7 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
u8 *start;
u8 *fault;
u8 *end;
+ u8 *pad;
int length;
int remainder;
@@ -851,8 +852,9 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
if (!remainder)
return 1;
+ pad = end - remainder;
metadata_access_enable();
- fault = memchr_inv(end - remainder, POISON_INUSE, remainder);
+ fault = memchr_inv(pad, POISON_INUSE, remainder);
metadata_access_disable();
if (!fault)
return 1;
@@ -860,9 +862,9 @@ static int slab_pad_check(struct kmem_cache *s, struct page *page)
end--;
slab_err(s, page, "Padding overwritten. 0x%p-0x%p", fault, end - 1);
- print_section(KERN_ERR, "Padding ", end - remainder, remainder);
+ print_section(KERN_ERR, "Padding ", pad, remainder);
- restore_bytes(s, "slab padding", POISON_INUSE, end - remainder, end);
+ restore_bytes(s, "slab padding", POISON_INUSE, fault, end);
return 0;
}