diff options
| author | Guillaume Nault <g.nault@alphalink.fr> | 2018-04-23 17:38:27 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-29 12:33:12 +0300 |
| commit | 88b7895e7c6ddeec0986ec90d6983d655006b796 (patch) | |
| tree | 47d9501977b21c76a697fdc0eb4ca5de62c832d4 /drivers/net/ppp/pppoe.c | |
| parent | ed2ba25f6d509431103ea3916f6db34595d62406 (diff) | |
| download | linux-88b7895e7c6ddeec0986ec90d6983d655006b796.tar.xz | |
pppoe: check sockaddr length in pppoe_connect()
[ Upstream commit a49e2f5d5fb141884452ddb428f551b123d436b5 ]
We must validate sockaddr_len, otherwise userspace can pass fewer data
than we expect and we end up accessing invalid data.
Fixes: 224cf5ad14c0 ("ppp: Move the PPP drivers")
Reported-by: syzbot+4f03bdf92fdf9ef5ddab@syzkaller.appspotmail.com
Signed-off-by: Guillaume Nault <g.nault@alphalink.fr>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/net/ppp/pppoe.c')
| -rw-r--r-- | drivers/net/ppp/pppoe.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/net/ppp/pppoe.c b/drivers/net/ppp/pppoe.c index 5aa59f41bf8c..71e2aef6b7a1 100644 --- a/drivers/net/ppp/pppoe.c +++ b/drivers/net/ppp/pppoe.c @@ -620,6 +620,10 @@ static int pppoe_connect(struct socket *sock, struct sockaddr *uservaddr, lock_sock(sk); error = -EINVAL; + + if (sockaddr_len != sizeof(struct sockaddr_pppox)) + goto end; + if (sp->sa_protocol != PX_PROTO_OE) goto end; |