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| author | NeilBrown <neilb@suse.de> | 2015-01-13 15:17:43 +1300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-27 08:29:40 -0800 |
| commit | d5471f896bb7a39074c802f22247cf332e4b5551 (patch) | |
| tree | a67821cf0cbb8c50ea92fbf9ff7486fbad922478 | |
| parent | 820b511fc45ef1719fc451539031a6ea02452c0e (diff) | |
| download | lwn-d5471f896bb7a39074c802f22247cf332e4b5551.tar.gz lwn-d5471f896bb7a39074c802f22247cf332e4b5551.zip | |
locks: fix NULL-deref in generic_delete_lease
commit 52d304eb4eaced9ad04b64ba7cd6ceb5153bbf18 upstream.
commit 0efaa7e82f02fe69c05ad28e905f31fc86e6f08e
locks: generic_delete_lease doesn't need a file_lock at all
moves the call to fl->fl_lmops->lm_change() to a place in the
code where fl might be a non-lease lock.
When that happens, fl_lmops is NULL and an Oops ensures.
So add an extra test to restore correct functioning.
Reported-by: Linda Walsh <suse@tlinx.org>
Link: https://bugzilla.suse.com/show_bug.cgi?id=912569
Fixes: 0efaa7e82f02fe69c05ad28e905f31fc86e6f08e
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/locks.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/locks.c b/fs/locks.c index 735b8d3fa78c..59e2f905e4ff 100644 --- a/fs/locks.c +++ b/fs/locks.c @@ -1702,7 +1702,7 @@ static int generic_delete_lease(struct file *filp) break; } trace_generic_delete_lease(inode, fl); - if (fl) + if (fl && IS_LEASE(fl)) error = fl->fl_lmops->lm_change(before, F_UNLCK, &dispose); spin_unlock(&inode->i_lock); locks_dispose_list(&dispose); |