linux-kernel - [PATCH 4/5] tools/perf/util: correct size computation

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Message-ID: <Pine.LNX.4.64.0912061016120.20858@ask.diku.dk>
Date:	Sun, 6 Dec 2009 10:16:30 +0100 (CET)
From:	Julia Lawall <julia@...u.dk>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 4/5] tools/perf/util: correct size computation

From: Julia Lawall <julia@...u.dk>

The size argument to zalloc should be the size of desired structure,
not the pointer to it.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@expression@
expression *x;
@@

x =
 <+...
-sizeof(x)
+sizeof(*x)
...+>// </smpl>

Signed-off-by: Julia Lawall <julia@...u.dk>

---
 tools/perf/util/parse-events.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -u -p a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -197,7 +197,7 @@ struct tracepoint_path *tracepoint_id_to
 			if (id == config) {
 				closedir(evt_dir);
 				closedir(sys_dir);
-				path = zalloc(sizeof(path));
+				path = zalloc(sizeof(*path));
 				path->system = malloc(MAX_EVENT_LENGTH);
 				if (!path->system) {
 					free(path);
--
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