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charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: UBSAN: object-size-mismatch in wg_xmit IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_batadv: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): macvtap0: link becomes ready IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_batadv: link becomes ready ================================================================================ UBSAN: object-size-mismatch in ./include/linux/skbuff.h:2085:28 member access within address ffffc9000278f420 with insufficient space for an object of type 'struct sk_buff' CPU: 1 PID: 3626 Comm: kworker/1:6 Not tainted 5.16.0-rc4-syzkaller-00161-gc741e49150db-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106 ubsan_epilogue lib/ubsan.c:151 [inline] handle_object_size_mismatch lib/ubsan.c:232 [inline] ubsan_type_mismatch_common+0x1e6/0x390 lib/ubsan.c:245 __ubsan_handle_type_mismatch_v1+0x4a/0x60 lib/ubsan.c:274 __skb_queue_before include/linux/skbuff.h:2085 [inline] __skb_queue_tail include/linux/skbuff.h:2118 [inline] wg_xmit+0x565/0xda0 drivers/net/wireguard/device.c:185 __netdev_start_xmit include/linux/netdevice.h:4994 [inline] netdev_start_xmit+0x7b/0x140 include/linux/netdevice.h:5008 xmit_one net/core/dev.c:3590 [inline] dev_hard_start_xmit+0x182/0x2e0 net/core/dev.c:3606 __dev_queue_xmit+0x158e/0x2540 net/core/dev.c:4229 neigh_output include/net/neighbour.h:527 [inline] ip6_finish_output2+0xf45/0x1300 net/ipv6/ip6_output.c:126 dst_output include/net/dst.h:450 [inline] NF_HOOK include/linux/netfilter.h:307 [inline] ndisc_send_skb+0x8c3/0xdd0 net/ipv6/ndisc.c:508 addrconf_dad_completed+0x543/0xa70 net/ipv6/addrconf.c:4216 addrconf_dad_work+0xbd8/0x1450 process_one_work+0x4ea/0x920 kernel/workqueue.c:2298 worker_thread+0x686/0x9e0 kernel/workqueue.c:2445 kthread+0x35c/0x430 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 ================================================================================ Tested on: commit: c741e491 Merge tag 'for-linus' of git://git.kernel.org.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git console output: https://syzkaller.appspot.com/x/log.txt?x=11102217f00000 kernel config: https://syzkaller.appspot.com/x/.config?x=308b87e56290f642 dashboard link: https://syzkaller.appspot.com/bug?extid=3cc1054e15babd5f4cd2 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 patch: https://syzkaller.appspot.com/x/patch.diff?x=1117be40080000