From: Antonio Messina Date: Thu, 19 Dec 2019 14:08:03 +0000 (+0100) Subject: udp: fix integer overflow while computing available space in sk_rcvbuf X-Git-Tag: v5.5-rc5~20^2~28 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=feed8a4fc9d46c3126fb9fcae0e9248270c6321a;p=linux.git udp: fix integer overflow while computing available space in sk_rcvbuf When the size of the receive buffer for a socket is close to 2^31 when computing if we have enough space in the buffer to copy a packet from the queue to the buffer we might hit an integer overflow. When an user set net.core.rmem_default to a value close to 2^31 UDP packets are dropped because of this overflow. This can be visible, for instance, with failure to resolve hostnames. This can be fixed by casting sk_rcvbuf (which is an int) to unsigned int, similarly to how it is done in TCP. Signed-off-by: Antonio Messina Signed-off-by: David S. Miller --- diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 4da5758cc718..93a355b6b092 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -1475,7 +1475,7 @@ int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb) * queue contains some other skb */ rmem = atomic_add_return(size, &sk->sk_rmem_alloc); - if (rmem > (size + sk->sk_rcvbuf)) + if (rmem > (size + (unsigned int)sk->sk_rcvbuf)) goto uncharge_drop; spin_lock(&list->lock);