tree 3abd9228346cb126ee798818c411a3c75214ff67
parent c7a936b1dd0f75727b776479f739236a05317f7b
author Guillaume Nault <g.nault@alphalink.fr> 1524492914 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1524994391 +0200

l2tp: check sockaddr length in pppol2tp_connect()


[ Upstream commit eb1c28c05894a4b1f6b56c5bf072205e64cfa280 ]

Check sockaddr_len before dereferencing sp->sa_protocol, to ensure that
it actually points to valid data.

Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts")
Reported-by: syzbot+a70ac890b23b1bf29f5c@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>