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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>
This commit is contained in:
Andrey Konovalov 2017-03-29 16:11:22 +02:00 committed by David S. Miller
parent 8f8d28e4d6
commit bcc5364bdc
1 changed files with 2 additions and 0 deletions
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2
net/packet/af_packet.c
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@ -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;
}