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ipv4: fix ip_send_skb()

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ip_send_skb() can send orphaned skb, so we must pass the net pointer to
avoid possible NULL dereference in error path.

Bug added by commit 3a7c384ffd (ipv4: tcp: unicast_sock should not
land outside of TCP stack)

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2012-08-10 02:22:47 +00:00 committed by David S. Miller
parent 63d02d157e
commit b5ec8eeac4
3 changed files with 4 additions and 5 deletions
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2
include/net/ip.h
View File

@ -120,7 +120,7 @@ extern struct sk_buff *__ip_make_skb(struct sock *sk,
struct flowi4 *fl4, struct flowi4 *fl4,
struct sk_buff_head *queue, struct sk_buff_head *queue,
struct inet_cork *cork); struct inet_cork *cork);
extern int ip_send_skb(struct sk_buff *skb); extern int ip_send_skb(struct net *net, struct sk_buff *skb);
extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4); extern int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4);
extern void ip_flush_pending_frames(struct sock *sk); extern void ip_flush_pending_frames(struct sock *sk);
extern struct sk_buff *ip_make_skb(struct sock *sk, extern struct sk_buff *ip_make_skb(struct sock *sk,

5
net/ipv4/ip_output.c
View File

@ -1366,9 +1366,8 @@ out:
return skb; return skb;
} }
int ip_send_skb(struct sk_buff *skb) int ip_send_skb(struct net *net, struct sk_buff *skb)
{ {
struct net *net = sock_net(skb->sk);
int err; int err;
err = ip_local_out(skb); err = ip_local_out(skb);
@ -1391,7 +1390,7 @@ int ip_push_pending_frames(struct sock *sk, struct flowi4 *fl4)
return 0; return 0;
/* Netfilter gets whole the not fragmented skb. */ /* Netfilter gets whole the not fragmented skb. */
return ip_send_skb(skb); return ip_send_skb(sock_net(sk), skb);
} }
/* /*

2
net/ipv4/udp.c
View File

@ -758,7 +758,7 @@ static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4)
uh->check = CSUM_MANGLED_0; uh->check = CSUM_MANGLED_0;
send: send:
err = ip_send_skb(skb); err = ip_send_skb(sock_net(sk), skb);
if (err) { if (err) {
if (err == -ENOBUFS && !inet->recverr) { if (err == -ENOBUFS && !inet->recverr) {
UDP_INC_STATS_USER(sock_net(sk), UDP_INC_STATS_USER(sock_net(sk),