linux-kernel - [PATCH 5/8] perf tools: Ensure sscanf does not overrun the "mem" field

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Message-Id: <1390336984-1553-6-git-send-email-acme@infradead.org>
Date:	Tue, 21 Jan 2014 17:43:01 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Alan Cox <alan@...ux.intel.com>,
	Alan Cox <gnomes@...rguk.ukuu.org.uk>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 5/8] perf tools: Ensure sscanf does not overrun the "mem" field

From: Alan Cox <alan@...ux.intel.com>

Make the parsing robust.

(perf has some other assumptions that BUFSIZE <= MAX_PATH which are
 not touched here)

Reported-by: Jackie Chang
Signed-off-by: Alan Cox <alan@...ux.intel.com>
Cc: Alan Cox <gnomes@...rguk.ukuu.org.uk>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/n/tip-g2uoiwbrpiimb63rx32qv8ne@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/header.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index bb3e0ede6183..893f8e2df928 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -930,7 +930,7 @@ static int write_topo_node(int fd, int node)
 		/* skip over invalid lines */
 		if (!strchr(buf, ':'))
 			continue;
-		if (sscanf(buf, "%*s %*d %s %"PRIu64, field, &mem) != 2)
+		if (sscanf(buf, "%*s %*d %31s %"PRIu64, field, &mem) != 2)
 			goto done;
 		if (!strcmp(field, "MemTotal:"))
 			mem_total = mem;
-- 
1.8.1.4

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