linux-kernel - [PATCH] ARC: return -EFAULT on failed access_ok for arc_usr

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Date:   Mon, 24 Oct 2016 11:47:14 +0100
From:   Colin King <colin.king@...onical.com>
To:     Vineet Gupta <vgupta@...opsys.com>, Jiri Slaby <jslaby@...e.cz>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-snps-arc@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] ARC: return -EFAULT on failed access_ok for arc_usr_cmpxchg syscall

From: Colin Ian King <colin.king@...onical.com>

arc_usr_cmpxchg currently returns an uninitialized value in ret
on a failed access_ok call. Instead, return -EFAULT.

Signed-off-by: Colin Ian King <colin.king@...onical.com>
---
 arch/arc/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arc/kernel/process.c b/arch/arc/kernel/process.c
index a746008..9ae3e1c 100644
--- a/arch/arc/kernel/process.c
+++ b/arch/arc/kernel/process.c
@@ -47,7 +47,7 @@ SYSCALL_DEFINE3(arc_usr_cmpxchg, int *, uaddr, int, expected, int, new)
 	int ret;
 
 	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
-		return ret;
+		return -EFAULT;
 
 	preempt_disable();
 
-- 
2.9.3