linux-kernel - [PATCH 3.14 43/78] sched: Fix sched

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Date:	Mon,  9 Jun 2014 15:48:23 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Richard Weinberger <richard@....at>,
	Peter Zijlstra <peterz@...radead.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>, Dave Jones <davej@...hat.com>
Subject: [PATCH 3.14 43/78] sched: Fix sched_policy < 0 comparison

3.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Richard Weinberger <richard@....at>

commit b14ed2c273f8ab872ae4e6735fe5ab09cb14b8c3 upstream.

attr.sched_policy is u32, therefore a comparison against < 0 is never true.
Fix this by casting sched_policy to int.

This issue was reported by coverity CID 1219934.

Fixes: dbdb22754fde ("sched: Disallow sched_attr::sched_policy < 0")
Signed-off-by: Richard Weinberger <richard@....at>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Cc: Michael Kerrisk <mtk.manpages@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Link: http://lkml.kernel.org/r/1401741514-7045-1-git-send-email-richard@nod.at
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Cc: Dave Jones <davej@...hat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 kernel/sched/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3707,7 +3707,7 @@ SYSCALL_DEFINE3(sched_setattr, pid_t, pi
 	if (retval)
 		return retval;
 
-	if (attr.sched_policy < 0)
+	if ((int)attr.sched_policy < 0)
 		return -EINVAL;
 
 	rcu_read_lock();


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