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| author | Amir Goldstein <amir73il@gmail.com> | 2019-06-19 12:34:44 +0200 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2019-06-19 15:53:58 +0200 |
| commit | c285a2f01d692ef48d7243cf1072897bbd237407 (patch) | |
| tree | d6959488584787c33c90c971805e48920831289f /fs/notify/fanotify | |
| parent | quota: fix a problem about transfer quota (diff) | |
| download | linux-c285a2f01d692ef48d7243cf1072897bbd237407.tar.xz linux-c285a2f01d692ef48d7243cf1072897bbd237407.zip | |
fanotify: update connector fsid cache on add mark
When implementing connector fsid cache, we only initialized the cache
when the first mark added to object was added by FAN_REPORT_FID group.
We forgot to update conn->fsid when the second mark is added by
FAN_REPORT_FID group to an already attached connector without fsid
cache.
Reported-and-tested-by: syzbot+c277e8e2f46414645508@syzkaller.appspotmail.com
Fixes: 77115225acc6 ("fanotify: cache fsid in fsnotify_mark_connector")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/fanotify')
| -rw-r--r-- | fs/notify/fanotify/fanotify.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c index e6fde1a5c072..b428c295d13f 100644 --- a/fs/notify/fanotify/fanotify.c +++ b/fs/notify/fanotify/fanotify.c @@ -355,6 +355,10 @@ static __kernel_fsid_t fanotify_get_fsid(struct fsnotify_iter_info *iter_info) /* Mark is just getting destroyed or created? */ if (!conn) continue; + if (!(conn->flags & FSNOTIFY_CONN_FLAG_HAS_FSID)) + continue; + /* Pairs with smp_wmb() in fsnotify_add_mark_list() */ + smp_rmb(); fsid = conn->fsid; if (WARN_ON_ONCE(!fsid.val[0] && !fsid.val[1])) continue; |