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authorPavel Emelyanov <xemul@openvz.org>2008-03-21 15:52:00 -0700
committerDavid S. Miller <davem@davemloft.net>2008-03-21 15:52:00 -0700
commit28518fc1701a757a3df8aa2d2ac2e5d1efd1c3e5 (patch)
treefde53a9cca0abc6c9f7a5f67656d65c385c0ec8b /net
parentb1153f29ee07dc1a788964409255a4b4fae50b98 (diff)
[NET]: NULL pointer dereference and other nasty things in /proc/net/(tcp|udp)[6]
Commits f40c81 ([NETNS][IPV4] tcp - make proc handle the network namespaces) and a91275 ([NETNS][IPV6] udp - make proc handle the network namespace) both introduced bad checks on sockets and tw buckets to belong to proper net namespace. I.e. when checking for socket to belong to given net and family the do { sk = sk_next(sk); } while (sk && sk->sk_net != net && sk->sk_family != family); constructions were used. This is wrong, since as soon as the sk->sk_net fits the net the socket is immediately returned, even if it belongs to other family. As the result four /proc/net/(udp|tcp)[6] entries show wrong info. The udp6 entry even oopses when dereferencing inet6_sk(sk) pointer: static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) { ... struct ipv6_pinfo *np = inet6_sk(sp); ... dest = &np->daddr; /* will be NULL for AF_INET sockets */ ... seq_printf(... dest->s6_addr32[0], dest->s6_addr32[1], dest->s6_addr32[2], dest->s6_addr32[3], ... Fix it by converting && to ||. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Daniel Lezcano <dlezcano@fr.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/tcp_ipv4.c4
-rw-r--r--net/ipv4/udp.c2
2 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 744bc9d6ceb..0ba6e911c97 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2050,7 +2050,7 @@ static void *established_get_first(struct seq_file *seq)
st->state = TCP_SEQ_STATE_TIME_WAIT;
inet_twsk_for_each(tw, node,
&tcp_hashinfo.ehash[st->bucket].twchain) {
- if (tw->tw_family != st->family &&
+ if (tw->tw_family != st->family ||
tw->tw_net != net) {
continue;
}
@@ -2078,7 +2078,7 @@ static void *established_get_next(struct seq_file *seq, void *cur)
tw = cur;
tw = tw_next(tw);
get_tw:
- while (tw && tw->tw_family != st->family && tw->tw_net != net) {
+ while (tw && (tw->tw_family != st->family || tw->tw_net != net)) {
tw = tw_next(tw);
}
if (tw) {
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index a98c43c0a89..fa946829d1e 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -1537,7 +1537,7 @@ static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
sk = sk_next(sk);
try_again:
;
- } while (sk && sk->sk_net != net && sk->sk_family != state->family);
+ } while (sk && (sk->sk_net != net || sk->sk_family != state->family));
if (!sk && ++state->bucket < UDP_HTABLE_SIZE) {
sk = sk_head(state->hashtable + state->bucket);