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bridge: Fix IPv6 multicast snooping by correcting offset in MLDv2 report

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We actually want a pointer to the grec_nsrcr and not the following
field. Otherwise we can get very high values for *nsrcs as the first two
bytes of the IPv6 multicast address are being used instead, leading to
a failing pskb_may_pull() which results in MLDv2 reports not being
parsed.

Signed-off-by: Linus Lüssing <linus.luessing@web.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Linus Lüssing 2011-02-15 13:19:18 +00:00 committed by David S. Miller
parent 9cc6e0c4c4
commit 649e984d00
1 changed files with 1 additions and 1 deletions
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net/bridge/br_multicast.c
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@ -1013,7 +1013,7 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
nsrcs = skb_header_pointer(skb,
len + offsetof(struct mld2_grec,
grec_mca),
grec_nsrcs),
sizeof(_nsrcs), &_nsrcs);
if (!nsrcs)
return -EINVAL;