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authorEric Dumazet <edumazet@google.com>2015-03-11 18:42:02 -0700
committerDavid S. Miller <davem@davemloft.net>2015-03-11 23:51:18 -0400
commitc29390c6dfeee0944ac6b5610ebbe403944378fc (patch)
treebefe951b043be948957abb1db65cee36dd7a379b /net
parentxen-netback: notify immediately after pushing Tx response. (diff)
downloadlinux-dev-c29390c6dfeee0944ac6b5610ebbe403944378fc.tar.xz
linux-dev-c29390c6dfeee0944ac6b5610ebbe403944378fc.zip
xps: must clear sender_cpu before forwarding
John reported that my previous commit added a regression on his router. This is because sender_cpu & napi_id share a common location, so get_xps_queue() can see garbage and perform an out of bound access. We need to make sure sender_cpu is cleared before doing the transmit, otherwise any NIC busy poll enabled (skb_mark_napi_id()) can trigger this bug. Signed-off-by: Eric Dumazet <edumazet@google.com> Reported-by: John <jw@nuclearfallout.net> Bisected-by: John <jw@nuclearfallout.net> Fixes: 2bd82484bb4c ("xps: fix xps for stacked devices") Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/skbuff.c2
-rw-r--r--net/ipv4/ip_forward.c1
-rw-r--r--net/ipv6/ip6_output.c1
3 files changed, 3 insertions, 1 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index f80507823531..434e78e5254d 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -4173,7 +4173,7 @@ void skb_scrub_packet(struct sk_buff *skb, bool xnet)
skb->ignore_df = 0;
skb_dst_drop(skb);
skb->mark = 0;
- skb->sender_cpu = 0;
+ skb_sender_cpu_clear(skb);
skb_init_secmark(skb);
secpath_reset(skb);
nf_reset(skb);
diff --git a/net/ipv4/ip_forward.c b/net/ipv4/ip_forward.c
index 787b3c294ce6..d9bc28ac5d1b 100644
--- a/net/ipv4/ip_forward.c
+++ b/net/ipv4/ip_forward.c
@@ -67,6 +67,7 @@ static int ip_forward_finish(struct sk_buff *skb)
if (unlikely(opt->optlen))
ip_forward_options(skb);
+ skb_sender_cpu_clear(skb);
return dst_output(skb);
}
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 0a04a37305d5..7e80b61b51ff 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -318,6 +318,7 @@ static int ip6_forward_proxy_check(struct sk_buff *skb)
static inline int ip6_forward_finish(struct sk_buff *skb)
{
+ skb_sender_cpu_clear(skb);
return dst_output(skb);
}