Description: net/ipv6: avoid possible UAF in ip6_route_mpath_notify()
References:
Notes:
 carnil> Introduced in 3b1137fe7482 ("net: ipv6: Change notifications for multipath add
 carnil> to RTA_MULTIPATH"). Vulnerable versions: 4.11-rc1.
Bugs:
upstream: released (6.8) [685f7d531264599b3f167f1e94bbd22f120e5fab]
6.8-upstream-stable: released (6.8) [685f7d531264599b3f167f1e94bbd22f120e5fab]
6.7-upstream-stable: released (6.7.10) [61b34f73cdbdb8eaf9ea12e9e2eb3b29716c4dda]
6.6-upstream-stable: released (6.6.22) [ed883060c38721ed828061f6c0c30e5147326c9a]
6.1-upstream-stable: released (6.1.82) [394334fe2ae3b9f1e2332b873857e84cb28aac18]
5.10-upstream-stable: released (5.10.213) [79ce2e54cc0ae366f45516c00bf1b19aa43e9abe]
4.19-upstream-stable: released (4.19.310) [31ea5bcc7d4cd1423de6be327a2c034725704136]
sid: released (6.7.12-1)
6.1-bookworm-security: released (6.1.82-1)
5.10-bullseye-security: needed
4.19-buster-security: needed