[PATCH 06/25] fs: dquot: skip invalidate_bdev if bdev is NULL

[Dongsheng Yang]

There would be a NULL pointer dereference if bdev is NULL

Signed-off-by: Dongsheng Yang <yangds.fnst at cn.fujitsu.com>
---
 fs/quota/dquot.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/quota/dquot.c b/fs/quota/dquot.c
index 20d1f74..140397a 100644
--- a/fs/quota/dquot.c
+++ b/fs/quota/dquot.c
@@ -2208,7 +2208,8 @@ static int vfs_load_quota_inode(struct inode *inode, int type, int format_id,
 		 * of the cache could fail because of other unrelated dirty
 		 * data */
 		sync_filesystem(sb);
-		invalidate_bdev(sb->s_bdev);
+		if (sb->s_bdev)
+			invalidate_bdev(sb->s_bdev);
 	}
 	mutex_lock(&dqopt->dqonoff_mutex);
 	if (sb_has_quota_loaded(sb, type)) {
-- 
1.8.4.2