perf probe: Fix argv array size in probe parser

Since the syntax has been changed, probe definition needs
parameters less than MAX_PROBE_ARGS + 1 (probe-point +
arguments).

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091201001943.10235.80367.stgit@harusame>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 7 insertions, 4 deletions

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 4e418afd6705..510fdd4e5d37 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -151,7 +151,7 @@ static void parse_probe_point(char *arg, struct probe_point *pp)
 /* Parse an event definition. Note that any error must die. */
 static void parse_probe_event(const char *str)
 {
-        char *argv[MAX_PROBE_ARGS + 2]; /* Event + probe + args */
+        char *argv[MAX_PROBE_ARGS + 1]; /* probe + args */
         int argc, i;
         struct probe_point *pp = &session.probes[session.nr_probe];
 
@@ -169,6 +169,9 @@ static void parse_probe_event(const char *str)
                 /* Add an argument */
                 if (*str != '\0') {
                         const char *s = str;
+                        /* Check the limit number of arguments */
+                        if (argc == MAX_PROBE_ARGS + 1)
+                                semantic_error("Too many arguments");
 
                         /* Skip the argument */
                         while (!isspace(*str) && *str != '\0')
@@ -178,9 +181,9 @@ static void parse_probe_event(const char *str)
                         argv[argc] = strndup(s, str - s);
                         if (argv[argc] == NULL)
                                 die("strndup");
-                        if (++argc == MAX_PROBE_ARGS)
-                                semantic_error("Too many arguments");
-                        pr_debug("argv[%d]=%s\n", argc, argv[argc - 1]);
+                        pr_debug("argv[%d]=%s\n", argc, argv[argc]);
+                        argc++;
+
                 }
         } while (*str != '\0');
         if (!argc)