This is a note to let you know that I've just added the patch titled
connector: use nlmsg_len() to check message length
to the 3.4-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:
connector-use-nlmsg_len-to-check-message-length.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 6167e136d789ca819387fcdeebdb79a6ec89cf39 Mon Sep 17 00:00:00 2001
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Date: Mon, 30 Sep 2013 22:03:07 +0200
Subject: connector: use nlmsg_len() to check message length
From: Mathias Krause <minipli@xxxxxxxxxxxxxx>
[ Upstream commit 162b2bedc084d2d908a04c93383ba02348b648b0 ]
The current code tests the length of the whole netlink message to be
at least as long to fit a cn_msg. This is wrong as nlmsg_len includes
the length of the netlink message header. Use nlmsg_len() instead to
fix this "off-by-NLMSG_HDRLEN" size check.
Signed-off-by: Mathias Krause <minipli@xxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/connector/connector.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -157,17 +157,18 @@ static int cn_call_callback(struct sk_bu
static void cn_rx_skb(struct sk_buff *__skb)
{
struct nlmsghdr *nlh;
- int err;
struct sk_buff *skb;
+ int len, err;
skb = skb_get(__skb);
if (skb->len >= NLMSG_SPACE(0)) {
nlh = nlmsg_hdr(skb);
+ len = nlmsg_len(nlh);
- if (nlh->nlmsg_len < sizeof(struct cn_msg) ||
+ if (len < (int)sizeof(struct cn_msg) ||
skb->len < nlh->nlmsg_len ||
- nlh->nlmsg_len > CONNECTOR_MAX_MSG_SIZE) {
+ len > CONNECTOR_MAX_MSG_SIZE) {
kfree_skb(skb);
return;
}
Patches currently in stable-queue which might be from minipli@xxxxxxxxxxxxxx are
queue-3.4/unix_diag-fix-info-leak.patch
queue-3.4/proc-connector-fix-info-leaks.patch
queue-3.4/connector-use-nlmsg_len-to-check-message-length.patch
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