diff options
| author | Mathias Krause <minipli@googlemail.com> | 2013-09-30 22:03:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-04 04:23:41 -0800 |
| commit | c6077c905957eeb59616ab8a22f3a4527393d40e (patch) | |
| tree | 719abf6de7fbff48ad5ff920536191b822c9474d /drivers | |
| parent | f4358dfd80518a11e4386a15750ad2601d0cf539 (diff) | |
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>
Diffstat (limited to 'drivers')
| -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 dde6a0fad408..ea6efe86468e 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_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; } |