aboutsummaryrefslogtreecommitdiffstats
path: root/fs
diff options
context:
space:
mode:
authorEric Paris <eparis@redhat.com>2010-08-18 12:25:49 -0400
committerEric Paris <eparis@redhat.com>2010-08-22 20:09:41 -0400
commitfaa9560ae76ef50a3cbfb1a6afc0343fd8172374 (patch)
treeb62dcdece22b214d0e0c75848b4d02b8e9923d0c /fs
parent3dc8d7f07e7496c0c6702e7e4b1acc179fa94019 (diff)
downloadmrst-s0i3-test-faa9560ae76ef50a3cbfb1a6afc0343fd8172374.tar.gz
mrst-s0i3-test-faa9560ae76ef50a3cbfb1a6afc0343fd8172374.tar.xz
mrst-s0i3-test-faa9560ae76ef50a3cbfb1a6afc0343fd8172374.zip
fanotify: do not dereference inode_mark when it is unset
The fanotify code is supposed to get the group from the mark. It accidentally only used the inode_mark. If the vfsmount_mark was set but not the inode_mark it would deref the NULL inode_mark. Get the group from the correct place. Reported-by: Tvrtko Ursulin <tvrtko.ursulin@sophos.com> Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/notify/fsnotify.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 3970392b272..f3e3b355ba7 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -148,13 +148,14 @@ static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
const unsigned char *file_name,
struct fsnotify_event **event)
{
- struct fsnotify_group *group = inode_mark->group;
+ struct fsnotify_group *group = NULL;
__u32 inode_test_mask = (mask & ~FS_EVENT_ON_CHILD);
__u32 vfsmount_test_mask = (mask & ~FS_EVENT_ON_CHILD);
- pr_debug("%s: group=%p to_tell=%p mnt=%p mark=%p mask=%x data=%p"
- " data_is=%d cookie=%d event=%p\n", __func__, group, to_tell,
- mnt, inode_mark, mask, data, data_is, cookie, *event);
+ if (unlikely(!inode_mark && !vfsmount_mark)) {
+ BUG();
+ return 0;
+ }
/* clear ignored on inode modification */
if (mask & FS_MODIFY) {
@@ -168,18 +169,24 @@ static int send_to_group(struct inode *to_tell, struct vfsmount *mnt,
/* does the inode mark tell us to do something? */
if (inode_mark) {
+ group = inode_mark->group;
inode_test_mask &= inode_mark->mask;
inode_test_mask &= ~inode_mark->ignored_mask;
}
/* does the vfsmount_mark tell us to do something? */
if (vfsmount_mark) {
+ group = vfsmount_mark->group;
vfsmount_test_mask &= vfsmount_mark->mask;
vfsmount_test_mask &= ~vfsmount_mark->ignored_mask;
if (inode_mark)
vfsmount_test_mask &= ~inode_mark->ignored_mask;
}
+ pr_debug("%s: group=%p to_tell=%p mnt=%p mark=%p mask=%x data=%p"
+ " data_is=%d cookie=%d event=%p\n", __func__, group, to_tell,
+ mnt, inode_mark, mask, data, data_is, cookie, *event);
+
if (!inode_test_mask && !vfsmount_test_mask)
return 0;