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fanotify: initialize permission event watchdog state

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fanotify permission events are allocated with kmem_cache_alloc(), but
fanotify_alloc_perm_event() does not initialize watchdog_cnt.

The watchdog reads watchdog_cnt after the event is moved to access_list.
A stale value can make it warn too early or skip the warning.

Initialize watchdog_cnt when allocating a permission event.

Fixes: b8cf8fda52 ("fanotify: add watchdog for permission events")
Signed-off-by: Xuanqiang Luo <luoxuanqiang@kylinos.cn>
Link: https://patch.msgid.link/20260703031345.9354-1-xuanqiang.luo@linux.dev
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Xuanqiang Luo 2026-07-03 11:13:45 +08:00 committed by Jan Kara
parent 4a50a141f0
commit a3aa899823
1 changed files with 1 additions and 0 deletions
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fs/notify/fanotify/fanotify.c
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@ -599,6 +599,7 @@ static struct fanotify_event *fanotify_alloc_perm_event(const void *data,
pevent->hdr.pad = 0;
pevent->hdr.len = 0;
pevent->state = FAN_EVENT_INIT;
pevent->watchdog_cnt = 0;
pevent->path = *path;
/* NULL ppos means no range info */
pevent->ppos = range ? &range->pos : NULL;