Commit bcc5364b authored Mar 29, 2017 by Andrey Konovalov Committed by David S. Miller Mar 30, 2017

net/packet: fix overflow in check for tp_reserve



When calculating po->tp_hdrlen + po->tp_reserve the result can overflow.

Fix by checking that tp_reserve <= INT_MAX on assign.

Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent 8f8d28e4

net/packet/af_packet.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -3665,6 +3665,8 @@ packet_setsockopt(struct socket sock, int level, int optname, char __user optv
		return -EBUSY;
		if (copy_from_user(&val, optval, sizeof(val)))
		return -EFAULT;
		if (val > INT_MAX)
		return -EINVAL;
		po->tp_reserve = val;
		return 0;
		}