From: Kay Sievers <kay@vrfy.org>
Date: Mon, 30 Jul 2012 21:40:08 +0000 (-0700)
Subject: kmsg: /dev/kmsg - properly return possible copy_from_user() failure
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=cdf53441368cc02ee4aa8a8343a5dc25132836f0;p=openwrt%2Fstaging%2Fblogic.git

kmsg: /dev/kmsg - properly return possible copy_from_user() failure

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kay Sievers <kay@vrfy.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/kernel/printk.c b/kernel/printk.c
index 50c96b5651b6..852269adad25 100644
--- a/kernel/printk.c
+++ b/kernel/printk.c
@@ -389,8 +389,10 @@ static ssize_t devkmsg_writev(struct kiocb *iocb, const struct iovec *iv,
 
 	line = buf;
 	for (i = 0; i < count; i++) {
-		if (copy_from_user(line, iv[i].iov_base, iv[i].iov_len))
+		if (copy_from_user(line, iv[i].iov_base, iv[i].iov_len)) {
+			ret = -EFAULT;
 			goto out;
+		}
 		line += iv[i].iov_len;
 	}