From 0800c5f7a499a8961c3868e95cc4cf1715166457 Mon Sep 17 00:00:00 2001 From: ASANO Masahiro Date: Thu, 22 Dec 2005 13:24:54 +0900 Subject: [PATCH] [PATCH] fix posix lock on NFS NFS client prevents mandatory lock, but there is a flaw on it; Locks are possibly left if the mode is changed while locking. This permits unlocking even if the mandatory lock bits are set. Signed-off-by: ASANO Masahiro Signed-off-by: Linus Torvalds --- fs/nfs/file.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/nfs/file.c b/fs/nfs/file.c index eb5cd4c3bbf..7a79fbe9f53 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -509,7 +509,8 @@ static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl) return -EINVAL; /* No mandatory locks over NFS */ - if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID) + if ((inode->i_mode & (S_ISGID | S_IXGRP)) == S_ISGID && + fl->fl_type != F_UNLCK) return -ENOLCK; if (IS_GETLK(cmd)) -- 2.20.1