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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>
This commit is contained in:
Kirill A. Shutemov 2014-12-29 15:00:18 +02:00 committed by Eric Van Hensbergen
parent 9bfc52c109
commit ad80492df5
1 changed files with 2 additions and 1 deletions
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3
fs/9p/vfs_file.c
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@ -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