perf_counter tools: fix buffer overwrite problem for perf top command

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.

[ Impact: fix 'perf top' crash ]

LKML-Reference: <3fee128b0905092313x608e65e0l7b1116d86914114f@mail.gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/Documentation/perf_counter/builtin-top.c b/Documentation/perf_counter/builtin-top.c
index cd6f61d734181c4f7403f655e6d9a89f553dbfb1..b1549dd27720081f0c3638d2b3d5bafbae6164ac 100644 (file)
--- 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);