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| author | Mathias Krause <minipli@googlemail.com> | 2013-09-30 22:03:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-04 04:35:16 -0800 |
| commit | 5d6463753fb915bbf3930bd8a3c5b2a864f7adeb (patch) | |
| tree | 619ae4992ca7088fa9f49c695a1b0273d34621b5 | |
| parent | 214351333b67444e0a431ee349534f2cee1f8cef (diff) | |
| download | lwn-5d6463753fb915bbf3930bd8a3c5b2a864f7adeb.tar.gz lwn-5d6463753fb915bbf3930bd8a3c5b2a864f7adeb.zip | |
connector: use nlmsg_len() to check message length
[ 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@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/connector/connector.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c index 6ecfa758942c..0daa11e418b1 100644 --- a/drivers/connector/connector.c +++ b/drivers/connector/connector.c @@ -157,17 +157,18 @@ static int cn_call_callback(struct sk_buff *skb) 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_HDRLEN) { 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; } |