[PATCH 3/3] ntfs: Fix possible deadlock

[Ethan Tidmore <ethantidmore06@gmail.com>]

In the error path for ntfs_attr_map_whole_runlist() the lock is not
released.

Add release for lock.

Detected by Smatch:
fs/ntfs/attrib.c:5197 ntfs_non_resident_attr_collapse_range() warn:
inconsistent returns '&ni->runlist.lock'.

Fixes: 495e90fa33482 ("ntfs: update attrib operations")
Signed-off-by: Ethan Tidmore <ethantidmore06@gmail.com>
---
 fs/ntfs/attrib.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c
index 71ad870eceac..2af45df2aab1 100644
--- a/fs/ntfs/attrib.c
+++ b/fs/ntfs/attrib.c
@@ -5124,8 +5124,10 @@ int ntfs_non_resident_attr_collapse_range(struct ntfs_inode *ni, s64 start_vcn,
 
 	down_write(&ni->runlist.lock);
 	ret = ntfs_attr_map_whole_runlist(ni);
-	if (ret)
+	if (ret) {
+		up_write(&ni->runlist.lock);
 		return ret;
+	}
 
 	len = min(len, end_vcn - start_vcn);
 	for (rl = ni->runlist.rl, dst_cnt = 0; rl && rl->length; rl++)
-- 
2.53.0