isisd: fix ip/ipv6 reachability tlvs (backport #15655) #15998
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Don't allocate subtlvs container if there's nothing to add to it. If the container is allocated, the "sub-TLVs presence" bit is set in the TLVs even if there's no actual sub-TLVs, what violates the RFC. Fixes #14514. Signed-off-by: Igor Ryzhov <iryzhov@nfware.com> (cherry picked from commit c3d34b8)
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Don't allocate subtlvs container if there's nothing to add to it. If the container is allocated, the "sub-TLVs presence" bit is set in the TLVs even if there's no actual sub-TLVs, what violates the RFC.
Fixes #14514.
This is an automatic backport of pull request #15655 done by Mergify.