Messages in this thread Patch in this message | | | Date | Sun, 29 May 2011 20:22:56 +0200 (CEST) | From | Jesper Juhl <> | Subject | [PATCH] netfilter, ipvs: Avoid undefined order of evaluation in assignments to struct nf_conn * |
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In net/netfilter/ipvs/ip_vs_nfct.c::ip_vs_update_conntrack(), net/netfilter/ipvs/ip_vs_xmit.c::ip_vs_nat_xmit(), net/netfilter/ipvs/ip_vs_xmit.c::ip_vs_nat_xmit_v6(), net/netfilter/ipvs/ip_vs_xmit.c::ip_vs_icmp_xmit)() net/netfilter/ipvs/ip_vs_xmit.c::and ip_vs_icmp_xmit_v6() we do this: ... struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); ...
Since '=' is not a sequence point the order of these assignments happening is undefined. Luckily it's easy to avoid by just doing what is obviously the intended thing: struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
Signed-off-by: Jesper Juhl <jj@chaosbits.net> --- ip_vs_nfct.c | 2 +- ip_vs_xmit.c | 8 ++++---- 2 files changed, 5 insertions(+), 5 deletions(-)
Compile tested only. Patch is against Linus' tree as of a few minutes ago.
diff --git a/net/netfilter/ipvs/ip_vs_nfct.c b/net/netfilter/ipvs/ip_vs_nfct.c index f454c80..a3d86c2 100644 --- a/net/netfilter/ipvs/ip_vs_nfct.c +++ b/net/netfilter/ipvs/ip_vs_nfct.c @@ -82,7 +82,7 @@ void ip_vs_update_conntrack(struct sk_buff *skb, struct ip_vs_conn *cp, int outin) { enum ip_conntrack_info ctinfo; - struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); + struct nf_conn *ct = nf_ct_get(skb, &ctinfo); struct nf_conntrack_tuple new_tuple; if (ct == NULL || nf_ct_is_confirmed(ct) || nf_ct_is_untracked(ct) || diff --git a/net/netfilter/ipvs/ip_vs_xmit.c b/net/netfilter/ipvs/ip_vs_xmit.c index ee319a4..16d129e 100644 --- a/net/netfilter/ipvs/ip_vs_xmit.c +++ b/net/netfilter/ipvs/ip_vs_xmit.c @@ -544,7 +544,7 @@ ip_vs_nat_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) if (cp->flags & IP_VS_CONN_F_SYNC && local) { enum ip_conntrack_info ctinfo; - struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); + struct nf_conn *ct = nf_ct_get(skb, &ctinfo); if (ct && !nf_ct_is_untracked(ct)) { IP_VS_DBG_RL_PKT(10, AF_INET, pp, skb, 0, @@ -661,7 +661,7 @@ ip_vs_nat_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) if (cp->flags & IP_VS_CONN_F_SYNC && local) { enum ip_conntrack_info ctinfo; - struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); + struct nf_conn *ct = nf_ct_get(skb, &ctinfo); if (ct && !nf_ct_is_untracked(ct)) { IP_VS_DBG_RL_PKT(10, AF_INET6, pp, skb, 0, @@ -1176,7 +1176,7 @@ ip_vs_icmp_xmit(struct sk_buff *skb, struct ip_vs_conn *cp, #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) if (cp->flags & IP_VS_CONN_F_SYNC && local) { enum ip_conntrack_info ctinfo; - struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); + struct nf_conn *ct = nf_ct_get(skb, &ctinfo); if (ct && !nf_ct_is_untracked(ct)) { IP_VS_DBG(10, "%s(): " @@ -1296,7 +1296,7 @@ ip_vs_icmp_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp, #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) if (cp->flags & IP_VS_CONN_F_SYNC && local) { enum ip_conntrack_info ctinfo; - struct nf_conn *ct = ct = nf_ct_get(skb, &ctinfo); + struct nf_conn *ct = nf_ct_get(skb, &ctinfo); if (ct && !nf_ct_is_untracked(ct)) { IP_VS_DBG(10, "%s(): "
-- Jesper Juhl <jj@chaosbits.net> http://www.chaosbits.net/ Don't top-post http://www.catb.org/jargon/html/T/top-post.html Plain text mails only, please.
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