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Commit b642f726 authored by Kirill A. Shutemov's avatar Kirill A. Shutemov Committed by Eric Van Hensbergen
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9p: do not crash on unknown lock status code 



Current 9p implementation will crash whole system if sees unknown lock
status code. It's trivial target for DOS: 9p server can produce such
code easily.

Let's fallback more gracefully: warning in dmesg + -ENOLCK.

Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: default avatarDominique Martinet <dominique.martinet@cea.fr>
Signed-off-by: default avatarEric Van Hensbergen <ericvh@gmail.com>
parent ad80492d

fs/9p/vfs_file.c

+3 −2
Original line number Diff line number Diff line
@@ -212,12 +212,13 @@ static int v9fs_file_do_lock(struct file *filp, int cmd, struct file_lock *fl) 
	case P9_LOCK_BLOCKED:

		res = -EAGAIN;

		break;

	default:

		WARN_ONCE(1, "unknown lock status code: %d\n", status);

		/* fallthough */

	case P9_LOCK_ERROR:

	case P9_LOCK_GRACE:

		res = -ENOLCK;

		break;

	default:

		BUG();

	}



out_unlock: