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6921d1e07c
If the processing of the tr->events loop fails, the filter that has been added to filter_head will be released twice in free_filter_list(&head->rcu) and __free_filter(filter). After adding the filter of tr->events, add the filter to the filter_head process to avoid triggering uaf. Link: https://lore.kernel.org/tencent_4EF87A626D702F816CD0951CE956EC32CD0A@qq.com Fixes: a9d0aab5eb33 ("tracing: Fix regression of filter waiting a long time on RCU synchronization") Reported-by: syzbot+daba72c4af9915e9c894@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=daba72c4af9915e9c894 Tested-by: syzbot+daba72c4af9915e9c894@syzkaller.appspotmail.com Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org> Signed-off-by: Edward Adam Davis <eadavis@qq.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>