From: Eric Dumazet <edumazet@google.com> mainline inclusion from mainline-v7.2-rc1 commit 507541c2a8eeb76c02bd2511958f73a8cfa3e1bc category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/18538 CVE: CVE-2026-80646 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i... -------------------------------- dev_get_by_index_rcu() could return NULL if the original physical device is unregistered. Found by Sashiko. Fixes: e1ae5c2ea478 ("vrf: Increment Icmp6InMsgs on the original netdev") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Stephen Suryaputra <ssuryaextr@gmail.com> Reviewed-by: Ido Schimmel <idosch@nvidia.com> Link: https://patch.msgid.link/20260526145529.3587126-2-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: JiangJieHua <jiangjiehua1@huawei.com> --- include/net/addrconf.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/include/net/addrconf.h b/include/net/addrconf.h index 10d270f004f0d..9d24316964b04 100644 --- a/include/net/addrconf.h +++ b/include/net/addrconf.h @@ -351,8 +351,11 @@ static inline struct inet6_dev *__in6_dev_get(const struct net_device *dev) static inline struct inet6_dev *__in6_dev_stats_get(const struct net_device *dev, const struct sk_buff *skb) { - if (netif_is_l3_master(dev)) + if (netif_is_l3_master(dev)) { dev = dev_get_by_index_rcu(dev_net(dev), inet6_iif(skb)); + if (!dev) + return NULL; + } return __in6_dev_get(dev); } -- 2.33.8