net/packet: fix overflow in tpacket_rcv
Using tp_reserve to calculate netoff can overflow as
tp_reserve is unsigned int and netoff is unsigned short.
This may lead to macoff receving a smaller value then
sizeof(struct virtio_net_hdr), and if po->has_vnet_hdr
is set, an out-of-bounds write will occur when
The bug is fixed by converting netoff to unsigned int
and checking if it exceeds USHRT_MAX.
TEST=Manually tried the reproducer before and after this fix.
RELEASE_NOTE=Fixed overflow in tpacket_rcv, which caused
Fixes: 8913336a7e8d ("packet: add PACKET_RESERVE sockopt")
Signed-off-by: Or Cohen <email@example.com>
Signed-off-by: Roy Yang <firstname.lastname@example.org>
Reviewed-by: Vaibhav Rustagi <email@example.com>
Reviewed-by: Robert Kolchmeyer <firstname.lastname@example.org>
Tested-by: Robert Kolchmeyer <email@example.com>
1 file changed