[3.8.y.z extended stable] Patch "ipc: set EFAULT as default error in load_msg()" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    ipc: set EFAULT as default error in load_msg()

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.14.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From cbed51d570ee39341e3d4e4f91d8439405cd32b9 Mon Sep 17 00:00:00 2001
From: Peter Hurley <peter at hurleysoftware.com>
Date: Tue, 30 Apr 2013 19:14:42 -0700
Subject: ipc: set EFAULT as default error in load_msg()

commit 2b3097a294b6daaf390010de14ca50bfccbc6fb6 upstream.

Signed-off-by: Peter Hurley <peter at hurleysoftware.com>
Acked-by: Stanislav Kinsbursky <skinsbursky at parallels.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
[ kamal: 3.8 stable prereq for
  4e9b45a ipc, msg: fix message length check for negative values ]
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 ipc/msgutil.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/ipc/msgutil.c b/ipc/msgutil.c
index b79582d..d33fbb2 100644
--- a/ipc/msgutil.c
+++ b/ipc/msgutil.c
@@ -84,7 +84,7 @@ struct msg_msg *load_msg(const void __user *src, int len)
 {
 	struct msg_msg *msg;
 	struct msg_msgseg *seg;
-	int err;
+	int err = -EFAULT;
 	int alen;

 	msg = alloc_msg(len);
@@ -92,19 +92,15 @@ struct msg_msg *load_msg(const void __user *src, int len)
 		return ERR_PTR(-ENOMEM);

 	alen = min(len, DATALEN_MSG);
-	if (copy_from_user(msg + 1, src, alen)) {
-		err = -EFAULT;
+	if (copy_from_user(msg + 1, src, alen))
 		goto out_err;
-	}

 	for (seg = msg->next; seg != NULL; seg = seg->next) {
 		len -= alen;
 		src = (char __user *)src + alen;
 		alen = min(len, DATALEN_SEG);
-		if (copy_from_user(seg + 1, src, alen)) {
-			err = -EFAULT;
+		if (copy_from_user(seg + 1, src, alen))
 			goto out_err;
-		}
 	}

 	err = security_msg_msg_alloc(msg);
--
1.8.3.2