Linux happened to process invalid ND messages with invalid options
- length of ND options is 0
- length of ND options is not enough
Specification says that such messages must be silently discarded.
This patch parses/checks ND options before it changes state of
neighbour / address etc. and ignores such messages.
Following patch is against linux-2.4.19.
Patch applied to 2.4.x and 2.5.x, thanks a lot.
Let us hope more patches like this one are coming :-)
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