linux-kernel - RE: [PATCH] perf: increase size of buf in perf_evsel__hists

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Date:   Sat, 31 Oct 2020 11:27:13 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Song Liu' <songliubraving@...com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     stable <stable@...r.kernel.org>, Jin Yao <yao.jin@...ux.intel.com>,
        "Jiri Olsa" <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        "Arnaldo Carvalho de Melo" <acme@...nel.org>
Subject: RE: [PATCH] perf: increase size of buf in perf_evsel__hists_browse()

From: Song Liu
> Sent: 30 October 2020 23:55
> 
> Making perf with gcc-9.1.1 generates the following warning:
> 
>   CC       ui/browsers/hists.o
> ui/browsers/hists.c: In function 'perf_evsel__hists_browse':
> ui/browsers/hists.c:3078:61: error: '%d' directive output may be \
> truncated writing between 1 and 11 bytes into a region of size \
> between 2 and 12 [-Werror=format-truncation=]
> 
>  3078 |       "Max event group index to sort is %d (index from 0 to %d)",
>       |                                                             ^~
> ui/browsers/hists.c:3078:7: note: directive argument in the range [-2147483648, 8]
>  3078 |       "Max event group index to sort is %d (index from 0 to %d)",
>       |       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> In file included from /usr/include/stdio.h:937,
>                  from ui/browsers/hists.c:5:
> 
> IOW, the string in line 3078 might be too long for buf[] of 64 bytes.
> 
> Fix this by increasing the size of buf[] to 128.

ISTM that something should be unsigned so that the bound check
that puts an upper bound of 8 implies a lower bound.

	David

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