From: akpm@linux-foundation.org
To: cl@linux.com, dongli.zhang@oracle.com, erosca@de.adit-jv.com,
iamjoonsoo.kim@lge.com, joe.jin@oracle.com,
mm-commits@vger.kernel.org, penberg@kernel.org,
rientjes@google.com, stable@vger.kernel.org
Subject: + mm-slub-fix-conversion-of-freelist_corrupted.patch added to -mm tree
Date: Mon, 24 Aug 2020 11:21:51 -0700 [thread overview]
Message-ID: <20200824182151.Ugg3eyuAJ%akpm@linux-foundation.org> (raw)
The patch titled
Subject: mm: slub: fix conversion of freelist_corrupted()
has been added to the -mm tree. Its filename is
mm-slub-fix-conversion-of-freelist_corrupted.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-slub-fix-conversion-of-freelist_corrupted.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-slub-fix-conversion-of-freelist_corrupted.patch
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------------------------------------------------------
From: Eugeniu Rosca <erosca@de.adit-jv.com>
Subject: mm: slub: fix conversion of freelist_corrupted()
Commit 52f23478081ae0 ("mm/slub.c: fix corrupted freechain in
deactivate_slab()") suffered an update when picked up from LKML [1].
Specifically, relocating 'freelist = NULL' into 'freelist_corrupted()'
created a no-op statement. Fix it by sticking to the behavior intended in
the original patch [1]. In addition, make freelist_corrupted() immune to
passing NULL instead of &freelist.
The issue has been spotted via static analysis and code review.
[1] https://lore.kernel.org/linux-mm/20200331031450.12182-1-dongli.zhang@oracle.com/
Link: https://lkml.kernel.org/r/20200824130643.10291-1-erosca@de.adit-jv.com
Fixes: 52f23478081ae0 ("mm/slub.c: fix corrupted freechain in deactivate_slab()")
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Cc: Dongli Zhang <dongli.zhang@oracle.com>
Cc: Joe Jin <joe.jin@oracle.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>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/slub.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
--- a/mm/slub.c~mm-slub-fix-conversion-of-freelist_corrupted
+++ a/mm/slub.c
@@ -672,12 +672,12 @@ static void slab_fix(struct kmem_cache *
}
static bool freelist_corrupted(struct kmem_cache *s, struct page *page,
- void *freelist, void *nextfree)
+ void **freelist, void *nextfree)
{
if ((s->flags & SLAB_CONSISTENCY_CHECKS) &&
- !check_valid_pointer(s, page, nextfree)) {
- object_err(s, page, freelist, "Freechain corrupt");
- freelist = NULL;
+ !check_valid_pointer(s, page, nextfree) && freelist) {
+ object_err(s, page, *freelist, "Freechain corrupt");
+ *freelist = NULL;
slab_fix(s, "Isolate corrupted freechain");
return true;
}
@@ -1494,7 +1494,7 @@ static inline void dec_slabs_node(struct
int objects) {}
static bool freelist_corrupted(struct kmem_cache *s, struct page *page,
- void *freelist, void *nextfree)
+ void **freelist, void *nextfree)
{
return false;
}
@@ -2184,7 +2184,7 @@ static void deactivate_slab(struct kmem_
* 'freelist' is already corrupted. So isolate all objects
* starting at 'freelist'.
*/
- if (freelist_corrupted(s, page, freelist, nextfree))
+ if (freelist_corrupted(s, page, &freelist, nextfree))
break;
do {
_
Patches currently in -mm which might be from erosca@de.adit-jv.com are
mm-slub-fix-conversion-of-freelist_corrupted.patch
next reply other threads:[~2020-08-24 18:21 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-24 18:21 akpm [this message]
-- strict thread matches above, loose matches on Subject: below --
2020-08-07 6:16 incoming Andrew Morton
2020-08-11 20:49 ` + mm-slub-fix-conversion-of-freelist_corrupted.patch added to -mm tree Andrew Morton
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