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

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Date:   Fri, 30 Oct 2020 16:54:31 -0700
From:   Song Liu <songliubraving@...com>
To:     <linux-kernel@...r.kernel.org>
CC:     Song Liu <songliubraving@...com>, 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: [PATCH] perf: increase size of buf in perf_evsel__hists_browse()

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.

Fixes: dbddf1747441  ("perf report/top TUI: Support hotkeys to let user select any event for sorting")
Cc: stable <stable@...r.kernel.org> # v5.7+
Cc: Jin Yao <yao.jin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Signed-off-by: Song Liu <songliubraving@...com>
---
 tools/perf/ui/browsers/hists.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
index a07626f072087..b0e1880cf992b 100644
--- a/tools/perf/ui/browsers/hists.c
+++ b/tools/perf/ui/browsers/hists.c
@@ -2963,7 +2963,7 @@ static int perf_evsel__hists_browse(struct evsel *evsel, int nr_events,
 	struct popup_action actions[MAX_OPTIONS];
 	int nr_options = 0;
 	int key = -1;
-	char buf[64];
+	char buf[128];
 	int delay_secs = hbt ? hbt->refresh : 0;
 
 #define HIST_BROWSER_HELP_COMMON					\
-- 
2.24.1