tree 663d4e248fa7392c2497fb536bec1e29852a8840
parent 67a4e294c4cb1bbb3f836554ad614ce5aca109b4
author Yang Jihong <yangjihong1@huawei.com> 1669721409 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1673089656 +0100

tracing: Fix infinite loop in tracing_read_pipe on overflowed print_trace_line

commit c1ac03af6ed45d05786c219d102f37eb44880f28 upstream.

print_trace_line may overflow seq_file buffer. If the event is not
consumed, the while loop keeps peeking this event, causing a infinite loop.

Link: https://lkml.kernel.org/r/20221129113009.182425-1-yangjihong1@huawei.com

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: stable@vger.kernel.org
Fixes: 088b1e427dbba ("ftrace: pipe fixes")
Signed-off-by: Yang Jihong <yangjihong1@huawei.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>