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netlink: Warn on unordered or illegal nla_nest_cancel() or nlmsg_cancel()
authorThomas Graf <tgraf@suug.ch>
Tue, 6 Jan 2015 00:04:21 +0000 (01:04 +0100)
committerDavid S. Miller <davem@davemloft.net>
Tue, 6 Jan 2015 03:38:22 +0000 (22:38 -0500)
commit3dc359d9ce9f98106032e511bada9b1b80ea008e
treece3d14e96bbebea22427f2d0d61ee52d840d007etree | snapshot
parenta0a0e9d3b7bcfc6ad577ecad914e382a760cad4bcommit | diff
netlink: Warn on unordered or illegal nla_nest_cancel() or nlmsg_cancel()

Calling nla_nest_cancel() in a different order as the nesting was
built up can lead to negative offsets being calculated which
results in skb_trim() being called with an underflowed unsigned
int. Warn if mark < skb->data as it's definitely a bug.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
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