bgpd: improve flowspec NLRI validation (backport #20814) - #20830
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Validate flowspec NLRIs more carefully during parsing. Reported-by: Joshua Rogers <joshua@joshua.hu> Signed-off-by: Mark Stapp <mjs@cisco.com> (cherry picked from commit aa0a8cc)
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Validate flowspec NLRIs more carefully during parsing, especially offsets into the message buffer.
This is an automatic backport of pull request #20814 done by [Mergify](https://mergify.com).