4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nick Desaulniers ndesaulniers@google.com
commit eee6ebbac18a189ef33d25ea9b8bcae176515e49 upstream.
Clang produces the following warning:
net/ipv4/netfilter/nf_nat_h323.c:553:6: error: logical not is only applied to the left hand side of this comparison [-Werror,-Wlogical-not-parentheses] if (!set_h225_addr(skb, protoff, data, dataoff, taddr, ^ add parentheses after the '!' to evaluate the comparison first add parentheses around left hand side expression to silence this warning
There's not necessarily a bug here, but it's cleaner to return early, ex:
if (x) return ...
rather than:
if (x == 0) ... else return
Also added a return code check that seemed to be missing in one instance.
Signed-off-by: Nick Desaulniers ndesaulniers@google.com Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Cc: Nathan Chancellor natechancellor@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/ipv4/netfilter/nf_nat_h323.c | 57 ++++++++++++++++++++------------------- 1 file changed, 30 insertions(+), 27 deletions(-)
--- a/net/ipv4/netfilter/nf_nat_h323.c +++ b/net/ipv4/netfilter/nf_nat_h323.c @@ -252,16 +252,16 @@ static int nat_rtp_rtcp(struct sk_buff * if (set_h245_addr(skb, protoff, data, dataoff, taddr, &ct->tuplehash[!dir].tuple.dst.u3, htons((port & htons(1)) ? nated_port + 1 : - nated_port)) == 0) { - /* Save ports */ - info->rtp_port[i][dir] = rtp_port; - info->rtp_port[i][!dir] = htons(nated_port); - } else { + nated_port))) { nf_ct_unexpect_related(rtp_exp); nf_ct_unexpect_related(rtcp_exp); return -1; }
+ /* Save ports */ + info->rtp_port[i][dir] = rtp_port; + info->rtp_port[i][!dir] = htons(nated_port); + /* Success */ pr_debug("nf_nat_h323: expect RTP %pI4:%hu->%pI4:%hu\n", &rtp_exp->tuple.src.u3.ip, @@ -370,15 +370,15 @@ static int nat_h245(struct sk_buff *skb, /* Modify signal */ if (set_h225_addr(skb, protoff, data, dataoff, taddr, &ct->tuplehash[!dir].tuple.dst.u3, - htons(nated_port)) == 0) { - /* Save ports */ - info->sig_port[dir] = port; - info->sig_port[!dir] = htons(nated_port); - } else { + htons(nated_port))) { nf_ct_unexpect_related(exp); return -1; }
+ /* Save ports */ + info->sig_port[dir] = port; + info->sig_port[!dir] = htons(nated_port); + pr_debug("nf_nat_q931: expect H.245 %pI4:%hu->%pI4:%hu\n", &exp->tuple.src.u3.ip, ntohs(exp->tuple.src.u.tcp.port), @@ -462,24 +462,27 @@ static int nat_q931(struct sk_buff *skb, /* Modify signal */ if (set_h225_addr(skb, protoff, data, 0, &taddr[idx], &ct->tuplehash[!dir].tuple.dst.u3, - htons(nated_port)) == 0) { - /* Save ports */ - info->sig_port[dir] = port; - info->sig_port[!dir] = htons(nated_port); - - /* Fix for Gnomemeeting */ - if (idx > 0 && - get_h225_addr(ct, *data, &taddr[0], &addr, &port) && - (ntohl(addr.ip) & 0xff000000) == 0x7f000000) { - set_h225_addr(skb, protoff, data, 0, &taddr[0], - &ct->tuplehash[!dir].tuple.dst.u3, - info->sig_port[!dir]); - } - } else { + htons(nated_port))) { nf_ct_unexpect_related(exp); return -1; }
+ /* Save ports */ + info->sig_port[dir] = port; + info->sig_port[!dir] = htons(nated_port); + + /* Fix for Gnomemeeting */ + if (idx > 0 && + get_h225_addr(ct, *data, &taddr[0], &addr, &port) && + (ntohl(addr.ip) & 0xff000000) == 0x7f000000) { + if (set_h225_addr(skb, protoff, data, 0, &taddr[0], + &ct->tuplehash[!dir].tuple.dst.u3, + info->sig_port[!dir])) { + nf_ct_unexpect_related(exp); + return -1; + } + } + /* Success */ pr_debug("nf_nat_ras: expect Q.931 %pI4:%hu->%pI4:%hu\n", &exp->tuple.src.u3.ip, @@ -550,9 +553,9 @@ static int nat_callforwarding(struct sk_ }
/* Modify signal */ - if (!set_h225_addr(skb, protoff, data, dataoff, taddr, - &ct->tuplehash[!dir].tuple.dst.u3, - htons(nated_port)) == 0) { + if (set_h225_addr(skb, protoff, data, dataoff, taddr, + &ct->tuplehash[!dir].tuple.dst.u3, + htons(nated_port))) { nf_ct_unexpect_related(exp); return -1; }