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Message-Id: <1453252038-31915-46-git-send-email-kamal@canonical.com>
Date: Tue, 19 Jan 2016 17:05:23 -0800
From: Kamal Mostafa <kamal@...onical.com>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org,
kernel-team@...ts.ubuntu.com
Cc: Mike Snitzer <snitzer@...hat.com>,
Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 045/160] dm btree: fix leak of bufio-backed block in btree_split_sibling error path
3.19.8-ckt13 -stable review patch. If anyone has any objections, please let me know.
---8<------------------------------------------------------------
From: Mike Snitzer <snitzer@...hat.com>
commit 30ce6e1cc5a0f781d60227e9096c86e188d2c2bd upstream.
The block allocated at the start of btree_split_sibling() is never
released if later insert_at() fails.
Fix this by releasing the previously allocated bufio block using
unlock_block().
Reported-by: Mikulas Patocka <mpatocka@...hat.com>
Signed-off-by: Mike Snitzer <snitzer@...hat.com>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
drivers/md/persistent-data/dm-btree.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/md/persistent-data/dm-btree.c b/drivers/md/persistent-data/dm-btree.c
index d6e4703..7ba85e2 100644
--- a/drivers/md/persistent-data/dm-btree.c
+++ b/drivers/md/persistent-data/dm-btree.c
@@ -471,8 +471,10 @@ static int btree_split_sibling(struct shadow_spine *s, dm_block_t root,
r = insert_at(sizeof(__le64), pn, parent_index + 1,
le64_to_cpu(rn->keys[0]), &location);
- if (r)
+ if (r) {
+ unlock_block(s->info, right);
return r;
+ }
if (key < le64_to_cpu(rn->keys[0])) {
unlock_block(s->info, right);
--
1.9.1
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