Patch "net: compat: Update get_compat_msghdr() to match copy_msghdr_from_user() behaviour" has been added to the 3.14-stable tree

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This is a note to let you know that I've just added the patch titled

    net: compat: Update get_compat_msghdr() to match copy_msghdr_from_user() behaviour

to the 3.14-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-compat-update-get_compat_msghdr-to-match-copy_msghdr_from_user-behaviour.patch
and it can be found in the queue-3.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From foo@baz Tue Mar 24 11:01:25 CET 2015
From: Catalin Marinas <catalin.marinas@xxxxxxx>
Date: Fri, 20 Mar 2015 16:48:13 +0000
Subject: net: compat: Update get_compat_msghdr() to match copy_msghdr_from_user() behaviour

From: Catalin Marinas <catalin.marinas@xxxxxxx>

[ Upstream commit 91edd096e224941131f896b86838b1e59553696a ]

Commit db31c55a6fb2 (net: clamp ->msg_namelen instead of returning an
error) introduced the clamping of msg_namelen when the unsigned value
was larger than sizeof(struct sockaddr_storage). This caused a
msg_namelen of -1 to be valid. The native code was subsequently fixed by
commit dbb490b96584 (net: socket: error on a negative msg_namelen).

In addition, the native code sets msg_namelen to 0 when msg_name is
NULL. This was done in commit (6a2a2b3ae075 net:socket: set msg_namelen
to 0 if msg_name is passed as NULL in msghdr struct from userland) and
subsequently updated by 08adb7dabd48 (fold verify_iovec() into
copy_msghdr_from_user()).

This patch brings the get_compat_msghdr() in line with
copy_msghdr_from_user().

Fixes: db31c55a6fb2 (net: clamp ->msg_namelen instead of returning an error)
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/compat.c |    7 +++++++
 1 file changed, 7 insertions(+)

--- a/net/compat.c
+++ b/net/compat.c
@@ -71,6 +71,13 @@ int get_compat_msghdr(struct msghdr *kms
 	    __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
 	    __get_user(kmsg->msg_flags, &umsg->msg_flags))
 		return -EFAULT;
+
+	if (!tmp1)
+		kmsg->msg_namelen = 0;
+
+	if (kmsg->msg_namelen < 0)
+		return -EINVAL;
+
 	if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
 		kmsg->msg_namelen = sizeof(struct sockaddr_storage);
 	kmsg->msg_name = compat_ptr(tmp1);


Patches currently in stable-queue which might be from catalin.marinas@xxxxxxx are

queue-3.14/net-compat-update-get_compat_msghdr-to-match-copy_msghdr_from_user-behaviour.patch
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