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authorJacob Wen <jian.w.wen@oracle.com>2019-01-31 15:18:56 +0800
committerDavid S. Miller <davem@davemloft.net>2019-01-31 08:58:46 -0800
commit91c524708de6207f59dd3512518d8a1c7b434ee3 (patch)
tree5e9c1df39ce270ed192b5dfa534a9a866ff7f9c0 /lib
parent3aa9179b2dfe06d32d4248f07cf6dd005a964507 (diff)
l2tp: copy 4 more bytes to linear part if necessary
The size of L2TPv2 header with all optional fields is 14 bytes. l2tp_udp_recv_core only moves 10 bytes to the linear part of a skb. This may lead to l2tp_recv_common read data outside of a skb. This patch make sure that there is at least 14 bytes in the linear part of a skb to meet the maximum need of l2tp_udp_recv_core and l2tp_recv_common. The minimum size of both PPP HDLC-like frame and Ethernet frame is larger than 14 bytes, so we are safe to do so. Also remove L2TP_HDR_SIZE_NOSEQ, it is unused now. Fixes: fd558d186df2 ("l2tp: Split pppol2tp patch into separate l2tp and ppp parts") Suggested-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: Jacob Wen <jian.w.wen@oracle.com> Acked-by: Guillaume Nault <gnault@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib')
0 files changed, 0 insertions, 0 deletions