Description: ipmr: fix kernel panic when forwarding mcast packets
References:
Notes:
 carnil> Introduced in bb7403655b3c ("ipmr: support IP_PKTINFO on cache report IGMP
 carnil> msg"). Vulnerable versions: 6.1.75 6.6.14 6.7.2 6.8-rc1.
Bugs:
upstream: released (6.8-rc3) [e622502c310f1069fd9f41cd38210553115f610a]
6.7-upstream-stable: released (6.7.4) [2e8c9ae40adda2be1ba41c05fd3cd1e61cce3207]
6.6-upstream-stable: released (6.6.16) [dcaafdba6c6162bb49f1192850bc3bbc3707738c]
6.1-upstream-stable: released (6.1.77) [d2f1b7fe74afd66298dbb3c7b39e7b62e4df1724]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.7.7-1)
6.1-bookworm-security: released (6.1.82-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"