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| author | Guillaume Nault <g.nault@alphalink.fr> | 2018-04-23 16:38:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-29 07:45:29 +0200 |
| commit | 8b467810a29ff4c2335225231a903f18dcf39d5a (patch) | |
| tree | cb9731afb89ecd32910aea15bd4788d2eaff3201 | |
| parent | a0475be870ab18f56df3ee3e925efd1688243b4c (diff) | |
| download | linux-8b467810a29ff4c2335225231a903f18dcf39d5a.tar.gz linux-8b467810a29ff4c2335225231a903f18dcf39d5a.tar.bz2 linux-8b467810a29ff4c2335225231a903f18dcf39d5a.zip | |
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>
| -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 262c30a514f5..960e3ab723a1 100644 --- a/drivers/net/ppp/pppoe.c +++ b/drivers/net/ppp/pppoe.c @@ -613,6 +613,10 @@ 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; |