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locks: fix list insertion when lock is split in two 

In the case where we're splitting a lock in two, the current code
the new "left" lock in the incorrect spot. It's inserted just
before "right" when it should instead be inserted just before the
new lock.

When we add a new lock, set "fl" to that value so that we can
add "left" before it.

Reported-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Jeff Layton <jeff.layton@primarydata.com>
This commit is contained in:
Jeff Layton 2015-02-17 17:08:23 -05:00
parent 267f112858
commit 2e2f756f81
1 changed files with 1 additions and 0 deletions
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1
fs/locks.c
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@ -1107,6 +1107,7 @@ static int __posix_lock_file(struct inode *inode, struct file_lock *request, str
}
locks_copy_lock(new_fl, request);
locks_insert_lock_ctx(new_fl, &fl->fl_list);
fl = new_fl;
new_fl = NULL;
}
if (right) {