bridge: Fix IPv6 multicast snooping by correcting offset in MLDv2 report
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>
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@ -1013,7 +1013,7 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
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nsrcs = skb_header_pointer(skb,
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len + offsetof(struct mld2_grec,
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grec_mca),
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grec_nsrcs),
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sizeof(_nsrcs), &_nsrcs);
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if (!nsrcs)
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return -EINVAL;
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