linux-kernel - [PATCH 2/2] perf hist: Refine signed integer checking

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250328122644.2383698-3-leo.yan@arm.com>
Date: Fri, 28 Mar 2025 12:26:44 +0000
From: Leo Yan <leo.yan@....com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Ian Rogers <irogers@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	linux-perf-users@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Leo Yan <leo.yan@....com>
Subject: [PATCH 2/2] perf hist: Refine signed integer checking

To avoid any issues caused by overflow in a signed integer, and since
the limit to USHRT_MAX is not necessary, this patch simply decrements
the signed integer and checks that it is greater than 0.

Signed-off-by: Leo Yan <leo.yan@....com>
---
 tools/perf/ui/stdio/hist.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/tools/perf/ui/stdio/hist.c b/tools/perf/ui/stdio/hist.c
index 7ac4b98e28bc..6da624309fab 100644
--- a/tools/perf/ui/stdio/hist.c
+++ b/tools/perf/ui/stdio/hist.c
@@ -1,5 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0
-#include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <linux/string.h>
@@ -25,10 +24,7 @@ static size_t callchain__fprintf_left_margin(FILE *fp, int left_margin)
 	int i;
 	int ret = fprintf(fp, "            ");
 
-	if (left_margin > USHRT_MAX)
-		left_margin = USHRT_MAX;
-
-	for (i = 0; i < left_margin; i++)
+	for (i = left_margin; i > 0; i--)
 		ret += fprintf(fp, " ");
 
 	return ret;
-- 
2.34.1