Draft: CVE-2024-27395: net: openvswitch: Fix Use-After-Free in ovs_ct_exit
requested to merge redhat/red-hat-ci-tools/kernel/bot-branches/centos-stream-9:backport-RHEL-36364-centos-stream-9-main into main
JIRA: https://issues.redhat.com/browse/RHEL-36364
CVE: CVE-2024-27395
net: openvswitch: Fix Use-After-Free in ovs_ct_exit
Since kfree_rcu, which is called in the hlist_for_each_entry_rcu traversal
of ovs_ct_limit_exit, is not part of the RCU read critical section, it
is possible that the RCU grace period will pass during the traversal and
the key will be free.
To prevent this, it should be changed to hlist_for_each_entry_safe.
Fixes: 11efd5cb04a1 ("openvswitch: Support conntrack zone limit")
Signed-off-by: Hyunwoo Kim <v4bel@theori.io>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Aaron Conole <aconole@redhat.com>
Link: https://lore.kernel.org/r/ZiYvzQN/Ry5oeFQW@v4bel-B760M-AORUS-ELITE-AX
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit 5ea7b72d4fac2fdbc0425cd8f2ea33abe95235b2)Signed-off-by: cki-backport-bot cki-ci-bot+cki-gitlab-backport-bot@redhat.com