linux-kernel - [PATCH 1/1] vfs: bio.c: fix: increment capacity only if krealloc() succeeded

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Message-Id: <1347109615-19556-1-git-send-email-anna.m.leuschner@gmail.com>
Date:	Sat,  8 Sep 2012 15:06:55 +0200
From:	Anna Leuschner <anna.m.leuschner@...il.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	Anna Leuschner <anna.m.leuschner@...il.com>
Subject: [PATCH 1/1] vfs: bio.c: fix: increment capacity only if krealloc() succeeded

Fix: only increment bio_slab_max if bio_slabs reallocation succeeded

Signed-off-by: Anna Leuschner <anna.m.leuschner@...il.com>
---
 fs/bio.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/bio.c b/fs/bio.c
index 71072ab..58707ff 100644
--- a/fs/bio.c
+++ b/fs/bio.c
@@ -74,6 +74,7 @@ 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, *new_bio_slabs;
+	unsigned int new_bio_slab_max;
 	unsigned int i, entry = -1;
 
 	mutex_lock(&bio_slab_lock);
@@ -96,12 +97,13 @@ static struct kmem_cache *bio_find_or_create_slab(unsigned int extra_size)
 		goto out_unlock;
 
 	if (bio_slab_nr == bio_slab_max && entry == -1) {
-		bio_slab_max <<= 1;
+		new_bio_slab_max = bio_slab_max << 1;
 		new_bio_slabs = krealloc(bio_slabs,
-					 bio_slab_max * sizeof(struct bio_slab),
+					 new_bio_slab_max * sizeof(struct bio_slab),
 					 GFP_KERNEL);
 		if (!new_bio_slabs)
 			goto out_unlock;
+		bio_slab_max = new_bio_slab_max;
 		bio_slabs = new_bio_slabs;
 	}
 	if (entry == -1)
-- 
1.7.9.5

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