Btrfs: fix possible memory leak in scrub_setup_recheck_block()

bbio has been malloced in btrfs_map_block() and should be
freed before leaving from the error handling cases.

spatch with a semantic match is used to found this problem.
(http://coccinelle.lip6.fr/)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>

diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index b223620cd5a6d59aa4b707e2539e59a8244d2dd1..4e9eafe01c55a5498e874336336c254336a8ae13 100644 (file)
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1029,6 +1029,7 @@ static int scrub_setup_recheck_block(struct scrub_dev *sdev,
                                spin_lock(&sdev->stat_lock);
                                sdev->stat.malloc_errors++;
                                spin_unlock(&sdev->stat_lock);
+                               kfree(bbio);
                                return -ENOMEM;
                        }
                        sblock->page_count++;