linux-kernel - Re: [PATCH] perf record: Fix segmentation fault in record__read_lost

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Date:   Sun, 25 Sep 2022 09:12:37 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        linux-perf-users <linux-perf-users@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf record: Fix segmentation fault in
 record__read_lost_samples()

Hi Namhyung,

On Sat, Sep 24, 2022 at 09:52:09AM -0700, Namhyung Kim wrote:

[...]

> > In the unprivileged mode perf fails to open PMU event, the function
> > record__open() returns error and "session->evlist" is NULL; this leads
> > to segmentation fault when iterates "session->evlist" in the function
> > record__read_lost_samples().
> >
> > This patch checks "session->evlist" in record__read_lost_samples(), if
> > "session->evlist" is NULL then the function directly bails out to avoid
> > segmentation fault.
> >
> > Fixes: a49aa8a54e86 ("perf record: Read and inject LOST_SAMPLES events")
> > Signed-off-by: Leo Yan <leo.yan@...aro.org>
> 
> Thanks for the fix and sorry for the inconvenience.
> Actually I sent the same fix a few weeks ago.
> 
> https://lore.kernel.org/r/20220909235024.278281-1-namhyung@kernel.org

Thanks a lot for the info and fix.  The patch in above link looks good
to me!  Please ignore this one.

Leo