From: Alexey Khoroshilov Date: Thu, 9 Aug 2012 13:19:25 +0000 (+0200) Subject: bio: Fix potential memory leak in bio_find_or_create_slab() X-Git-Tag: firefly_0821_release~3680^2~2156^2~8 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=389d7b26d9e4f78b17366c23a3aa16b3c5cb3bde;p=firefly-linux-kernel-4.4.55.git bio: Fix potential memory leak in bio_find_or_create_slab() Do not leak memory by updating pointer with potentially NULL realloc return value. Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov Acked-by: Jeff Moyer Signed-off-by: Jens Axboe --- diff --git a/fs/bio.c b/fs/bio.c index 73922abba832..fed1f799cb56 100644 --- a/fs/bio.c +++ b/fs/bio.c @@ -73,7 +73,7 @@ static struct kmem_cache *bio_find_or_create_slab(unsigned int extra_size) { unsigned int sz = sizeof(struct bio) + extra_size; struct kmem_cache *slab = NULL; - struct bio_slab *bslab; + struct bio_slab *bslab, *new_bio_slabs; unsigned int i, entry = -1; mutex_lock(&bio_slab_lock); @@ -97,11 +97,12 @@ static struct kmem_cache *bio_find_or_create_slab(unsigned int extra_size) if (bio_slab_nr == bio_slab_max && entry == -1) { bio_slab_max <<= 1; - bio_slabs = krealloc(bio_slabs, - bio_slab_max * sizeof(struct bio_slab), - GFP_KERNEL); - if (!bio_slabs) + new_bio_slabs = krealloc(bio_slabs, + bio_slab_max * sizeof(struct bio_slab), + GFP_KERNEL); + if (!new_bio_slabs) goto out_unlock; + bio_slabs = new_bio_slabs; } if (entry == -1) entry = bio_slab_nr++;