CVE-2022-49662

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> ipv6: fix lockdep splat in in6_dump_addrs()<br /> <br /> As reported by syzbot, we should not use rcu_dereference()<br /> when rcu_read_lock() is not held.<br /> <br /> WARNING: suspicious RCU usage<br /> 5.19.0-rc2-syzkaller #0 Not tainted<br /> <br /> net/ipv6/addrconf.c:5175 suspicious rcu_dereference_check() usage!<br /> <br /> other info that might help us debug this:<br /> <br /> rcu_scheduler_active = 2, debug_locks = 1<br /> 1 lock held by syz-executor326/3617:<br /> #0: ffffffff8d5848e8 (rtnl_mutex){+.+.}-{3:3}, at: netlink_dump+0xae/0xc20 net/netlink/af_netlink.c:2223<br /> <br /> stack backtrace:<br /> CPU: 0 PID: 3617 Comm: syz-executor326 Not tainted 5.19.0-rc2-syzkaller #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011<br /> Call Trace:<br /> <br /> __dump_stack lib/dump_stack.c:88 [inline]<br /> dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106<br /> in6_dump_addrs+0x12d1/0x1790 net/ipv6/addrconf.c:5175<br /> inet6_dump_addr+0x9c1/0xb50 net/ipv6/addrconf.c:5300<br /> netlink_dump+0x541/0xc20 net/netlink/af_netlink.c:2275<br /> __netlink_dump_start+0x647/0x900 net/netlink/af_netlink.c:2380<br /> netlink_dump_start include/linux/netlink.h:245 [inline]<br /> rtnetlink_rcv_msg+0x73e/0xc90 net/core/rtnetlink.c:6046<br /> netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2501<br /> netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]<br /> netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345<br /> netlink_sendmsg+0x917/0xe10 net/netlink/af_netlink.c:1921<br /> sock_sendmsg_nosec net/socket.c:714 [inline]<br /> sock_sendmsg+0xcf/0x120 net/socket.c:734<br /> ____sys_sendmsg+0x6eb/0x810 net/socket.c:2492<br /> ___sys_sendmsg+0xf3/0x170 net/socket.c:2546<br /> __sys_sendmsg net/socket.c:2575 [inline]<br /> __do_sys_sendmsg net/socket.c:2584 [inline]<br /> __se_sys_sendmsg net/socket.c:2582 [inline]<br /> __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582<br /> do_syscall_x64 arch/x86/entry/common.c:50 [inline]<br /> do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80<br /> entry_SYSCALL_64_after_hwframe+0x46/0xb0