CIFS: Fix lock consistensy bug in cifs_setlk

If we netogiate mandatory locking style, have a read lock and try to set a write lock we end up with a write lock in vfs cache and no lock in cifs lock cache - that's wrong. Fix it by returning from cifs_setlk immediately if a error occurs during setting a lock. Reviewed-by: Jeff Layton <[email protected]> Signed-off-by: Pavel Shilovsky <[email protected]> Signed-off-by: Steve French <[email protected]>
akeromi · Dec 5, 2012 · 21cb2d9 · 21cb2d9
1 parent f152fd5
commit 21cb2d9
Showing 1 changed file with 5 additions and 3 deletions.
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
@@ -1443,16 +1443,18 @@ cifs_setlk(struct file *file, struct file_lock *flock, __u32 type,
 			return -ENOMEM;
 
 		rc = cifs_lock_add_if(cfile, lock, wait_flag);
-		if (rc < 0)
+		if (rc < 0) {
 			kfree(lock);
-		if (rc <= 0)
+			return rc;
+		}
+		if (!rc)
 			goto out;
 
 		rc = server->ops->mand_lock(xid, cfile, flock->fl_start, length,
 					    type, 1, 0, wait_flag);
 		if (rc) {
 			kfree(lock);
-			goto out;
+			return rc;
 		}
 
 		cifs_lock_add(cfile, lock);