tracing: Fix infinite loop in tracing_read_pipe on overflowed print_trace_line

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commit c1ac03af6e 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: 088b1e427d ("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>

...

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Yang Jihong 2022-11-29 19:30:09 +08:00 • committed by Greg Kroah-Hartman

parent 2d31d84d4e

commit 26c57afef2

1 changed files with 14 additions and 1 deletions

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kernel/trace/trace.c

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