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| author | Jan Kara <jack@suse.cz> | 2017-10-31 09:53:28 +0100 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2017-10-31 17:41:04 +0100 |
| commit | b3a0066005821acdc0cdb092cb72587182ab583f (patch) | |
| tree | 9372eb76b9f3d2242c2a6ac5c8724f7546cd5e98 | |
| parent | ff5abbe799e29099695cb8b5b2f198dd8b8bdf26 (diff) | |
| download | linux-b3a0066005821acdc0cdb092cb72587182ab583f.tar.gz linux-b3a0066005821acdc0cdb092cb72587182ab583f.tar.bz2 linux-b3a0066005821acdc0cdb092cb72587182ab583f.zip | |
dnotify: Handle errors from fsnotify_add_mark_locked() in fcntl_dirnotify()
fsnotify_add_mark_locked() can fail but we do not check its return
value. This didn't matter before commit 9dd813c15b2c "fsnotify: Move
mark list head from object into dedicated structure" as none of possible
failures could happen for dnotify but after that commit -ENOMEM can be
returned. Handle this error properly in fcntl_dirnotify() as
otherwise we just hit BUG_ON(dn_mark->dn) in dnotify_free_mark().
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reported-by: syzkaller
Fixes: 9dd813c15b2c101168808d4f5941a29985758973
Signed-off-by: Jan Kara <jack@suse.cz>
| -rw-r--r-- | fs/notify/dnotify/dnotify.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/fs/notify/dnotify/dnotify.c b/fs/notify/dnotify/dnotify.c index cba328315929..63a1ca4b9dee 100644 --- a/fs/notify/dnotify/dnotify.c +++ b/fs/notify/dnotify/dnotify.c @@ -319,7 +319,11 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) dn_mark = container_of(fsn_mark, struct dnotify_mark, fsn_mark); spin_lock(&fsn_mark->lock); } else { - fsnotify_add_mark_locked(new_fsn_mark, inode, NULL, 0); + error = fsnotify_add_mark_locked(new_fsn_mark, inode, NULL, 0); + if (error) { + mutex_unlock(&dnotify_group->mark_mutex); + goto out_err; + } spin_lock(&new_fsn_mark->lock); fsn_mark = new_fsn_mark; dn_mark = new_dn_mark; @@ -345,6 +349,7 @@ int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg) */ if (dn_mark == new_dn_mark) destroy = 1; + error = 0; goto out; } |