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[v3,10/39] fs: dquot: skip invalidate_bdev if bdev is NULL

Message ID 1442307754-13233-11-git-send-email-yangds.fnst@cn.fujitsu.com
State New
Headers show

Commit Message

Yang Dongsheng Sept. 15, 2015, 9:02 a.m. UTC
There would be a NULL pointer dereference if bdev is NULL

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

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)) {