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| author | J. R. Okajima <hooanon05@yahoo.co.jp> | 2009-12-02 16:55:50 +0900 |
|---|---|---|
| committer | Pekka Enberg <penberg@cs.helsinki.fi> | 2009-12-06 10:24:03 +0200 |
| commit | ddbf2e8366f2a7fa3419be418cfd83a914d2527f (patch) | |
| tree | eb5780e7a91ccae58f7754e13627804f5f893320 /mm/slab.c | |
| parent | f3d8b53a3abbfd0b74fa5dfaa690870d9619fad9 (diff) | |
| download | lwn-ddbf2e8366f2a7fa3419be418cfd83a914d2527f.tar.gz lwn-ddbf2e8366f2a7fa3419be418cfd83a914d2527f.zip | |
slab, kmemleak: pass the correct pointer to kmemleak_erase()
In ____cache_alloc(), the variable 'ac' may be changed after
cache_alloc_refill() and the following kmemleak_erase() may get an incorrect
pointer. Update 'ac' after cache_alloc_refill() unconditionally.
See the following URL for the discussion of this patch:
http://marc.info/?l=linux-kernel&m=125873373124187&w=2
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: J. R. Okajima <hooanon05@yahoo.co.jp>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Diffstat (limited to 'mm/slab.c')
| -rw-r--r-- | mm/slab.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/slab.c b/mm/slab.c index 4e61449d7946..66e90477a4bb 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3103,6 +3103,11 @@ static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) } else { STATS_INC_ALLOCMISS(cachep); objp = cache_alloc_refill(cachep, flags); + /* + * the 'ac' may be updated by cache_alloc_refill(), + * and kmemleak_erase() requires its correct value. + */ + ac = cpu_cache_get(cachep); } /* * To avoid a false negative, if an object that is in one of the |