linux-kernel - [PATCH] sched: fix string comparison in features (v2)

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Date:	Mon, 13 Sep 2010 17:47:00 -0400
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, Tony Lindgren <tony@...mide.com>
Subject: [PATCH] sched: fix string comparison in features (v2)

Fix incorrect handling of the following case:

INTERACTIVE
INTERACTIVE_SOMETHING_ELSE

The comparison only checks up to each element's length.

Changelog since v1:
- Embellish using some Rostedisms.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Reviewed-by: Steven Rostedt <rostedt@...dmis.org>
---
 kernel/sched.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

Index: linux-2.6-lttng.git/kernel/sched.c
===================================================================
--- linux-2.6-lttng.git.orig/kernel/sched.c
+++ linux-2.6-lttng.git/kernel/sched.c
@@ -721,7 +721,7 @@ sched_feat_write(struct file *filp, cons
 		size_t cnt, loff_t *ppos)
 {
 	char buf[64];
-	char *cmp = buf;
+	char *cmp;
 	int neg = 0;
 	int i;
 
@@ -732,6 +732,7 @@ sched_feat_write(struct file *filp, cons
 		return -EFAULT;
 
 	buf[cnt] = 0;
+	cmp = strstrip(buf);
 
 	if (strncmp(buf, "NO_", 3) == 0) {
 		neg = 1;
@@ -739,9 +740,7 @@ sched_feat_write(struct file *filp, cons
 	}
 
 	for (i = 0; sched_feat_names[i]; i++) {
-		int len = strlen(sched_feat_names[i]);
-
-		if (strncmp(cmp, sched_feat_names[i], len) == 0) {
+		if (strcmp(cmp, sched_feat_names[i]) == 0) {
 			if (neg)
 				sysctl_sched_features &= ~(1UL << i);
 			else
-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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