9p: fix error handling in v9fs_file_do_lock

p9_client_lock_dotl() doesn't set status if p9_client_rpc() fails.
It can lead to 'default:' case in switch below and kernel crashes.

Let's bypass the switch if p9_client_lock_dotl() fails.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index b40133796b87..8d29e1e03dfa 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -194,7 +194,7 @@ static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
         for (;;) {
                 res = p9_client_lock_dotl(fid, &flock, &status);
                 if (res < 0)
-                        break;
+                        goto out_unlock;
 
                 if (status != P9_LOCK_BLOCKED)
                         break;
@@ -220,6 +220,7 @@ static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl)
                 BUG();
         }
 
+out_unlock:
         /*
          * incase server returned error for lock request, revert
          * it locally