ospf6d: check length before accessing grace LSA TLVs (backport #22539) - #22556
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Ensure that there is at least a TLV header's worth of data before accessing the header octets. Reported-by: Shubham Raj <shubham@causalsecurity.com> Signed-off-by: Mark Stapp <mjs@cisco.com> (cherry picked from commit 0ae847c)
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Ensure that there is at least a TLV header's worth of data before accessing the header octets when iterating through a grace LSA's TLVs.
This is an automatic backport of pull request #22539 done by [Mergify](https://mergify.com).