linux-kernel - Re: [PATCH] perf: probe: avoid segfault if passed with ''.

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Message-ID: <20150429222333.GE29633@kernel.org>
Date:	Wed, 29 Apr 2015 19:23:33 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Wang Nan <wangnan0@...wei.com>
Cc:	jolsa@...nel.org, dsahern@...il.com, paulus@...ba.org,
	a.p.zijlstra@...llo.nl, lizefan@...wei.com,
	linux-kernel@...r.kernel.org, mingo@...nel.org
Subject: Re: [PATCH] perf: probe: avoid segfault if passed with ''.

Em Tue, Apr 28, 2015 at 08:46:09AM +0000, Wang Nan escreveu:
> Since parse_perf_probe_point() deals with a user passed argument, we
> should not assume it to be a valid string.
> 
> Without this patch, if pass '' to perf probe, a segfault raises:
> 
>  $ perf probe -a ''
>  Segmentation fault
> 
> This patch checks argument of parse_perf_probe_point() before
> string processing.
> 
> After this patch:
> 
>  $ perf probe -a ''
> 
>   usage: perf probe [<options>] 'PROBEDEF' ['PROBEDEF' ...]
>      or: perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]
>      ...

Thanks, applied to perf/urgent.

- Arnaldo
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