From: Edward Adam Davis <eadavis@qq.com>
To: syzbot+daba72c4af9915e9c894@syzkaller.appspotmail.com
Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [trace?] KASAN: slab-use-after-free Read in __free_filter
Date: Tue, 24 Jun 2025 14:10:12 +0800 [thread overview]
Message-ID: <tencent_04E8067F098D2ED5AEC04C86E7DA06EC1206@qq.com> (raw)
In-Reply-To: <6859ea24.a00a0220.2e5631.0044.GAE@google.com>
#syz test
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index 08141f105c95..3885aadc434d 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -1436,13 +1436,6 @@ static void filter_free_subsystem_filters(struct trace_subsystem_dir *dir,
INIT_LIST_HEAD(&head->list);
- item = kmalloc(sizeof(*item), GFP_KERNEL);
- if (!item)
- goto free_now;
-
- item->filter = filter;
- list_add_tail(&item->list, &head->list);
-
list_for_each_entry(file, &tr->events, list) {
if (file->system != dir)
continue;
@@ -1454,6 +1447,13 @@ static void filter_free_subsystem_filters(struct trace_subsystem_dir *dir,
event_clear_filter(file);
}
+ item = kmalloc(sizeof(*item), GFP_KERNEL);
+ if (!item)
+ goto free_now;
+
+ item->filter = filter;
+ list_add_tail(&item->list, &head->list);
+
delay_free_filter(head);
return;
free_now:
next prev parent reply other threads:[~2025-06-24 6:10 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-23 23:58 syzbot
2025-06-24 6:10 ` Edward Adam Davis [this message]
2025-06-24 6:32 ` syzbot
2025-06-24 6:38 ` [PATCH] tracing: Fix filter logic error Edward Adam Davis
2025-06-24 7:44 ` Masami Hiramatsu
2025-06-24 19:17 ` Steven Rostedt
2025-06-24 8:25 ` [syzbot] [trace?] KASAN: slab-use-after-free Read in __free_filter Hillf Danton
2025-06-24 8:47 ` syzbot
2025-06-24 18:44 ` Steven Rostedt
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