linux-kernel - perf_counter: buffer overwrite problem for perf top command

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Message-ID: <3fee128b0905092313x608e65e0l7b1116d86914114f@mail.gmail.com>
Date:	Sun, 10 May 2009 02:13:19 -0400
From:	Erdem Aktas <eaktas1@...il.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: perf_counter: buffer overwrite problem for perf top command

Hi;
There is a buffer overwrite problem in builtin-top.c line 526, When I
tried to use ./perf top command, it was giving memory corruption
problem. should not we use malloc(strlen(str)+1) ?

Regards
-erdem


=======================
diff --git a/Documentation/perf_counter/builtin-top.c
b/Documentation/perf_counter/builtin-top.c
index cd6f61d..b1549dd 100644
--- a/Documentation/perf_counter/builtin-top.c
+++ b/Documentation/perf_counter/builtin-top.c
@@ -523,7 +523,7 @@ static int read_symbol(FILE *in, struct sym_entry *s)
 	if (strstr(sym, "_text_start") || strstr(sym, "_text_end"))
 		return 1;

-	s->sym = malloc(strlen(str));
+	s->sym = malloc(strlen(str)+1);
 	assert(s->sym);

 	strcpy((char *)s->sym, str);
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