netlink: 21 bytes leftover after parsing attributes in process `syz-executor.2'. general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 0 PID: 20573 Comm: syz-executor.2 Not tainted 5.6.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__list_del_entry_valid+0x22/0xf5 lib/list_debug.c:42 Code: 0e fe 48 8b 75 e8 eb b2 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 56 49 89 fe 48 83 c7 08 48 89 fa 41 55 48 c1 ea 03 41 54 <80> 3c 02 00 0f 85 a1 00 00 00 4c 89 f2 4d 8b 66 08 48 b8 00 00 00 RSP: 0018:ffffc90001837440 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff87b5a140 RCX: ffffffff815c1ec9 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008 RBP: ffffc90001837458 R08: 0000000000000004 R09: fffff52000306e7b R10: fffff52000306e7a R11: 0000000000000003 R12: 0000000000000000 R13: 0000000000000008 R14: 0000000000000000 R15: ffffffff8a98c300 FS: 00007f0feec14700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000076c000 CR3: 000000008c9e7000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry include/linux/list.h:132 [inline] list_del_init include/linux/list.h:204 [inline] smc_ib_remove_dev+0x52/0x2e0 net/smc/smc_ib.c:592 remove_client_context+0xc7/0x120 drivers/infiniband/core/device.c:724 disable_device+0x14c/0x230 drivers/infiniband/core/device.c:1268 __ib_unregister_device+0x9c/0x190 drivers/infiniband/core/device.c:1435 ib_unregister_device_and_put+0x5f/0x80 drivers/infiniband/core/device.c:1498 nldev_dellink+0x222/0x340 drivers/infiniband/core/nldev.c:1568 rdma_nl_rcv_msg drivers/infiniband/core/netlink.c:195 [inline] rdma_nl_rcv_skb drivers/infiniband/core/netlink.c:239 [inline] rdma_nl_rcv+0x5d9/0x980 drivers/infiniband/core/netlink.c:259 netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline] netlink_unicast+0x59e/0x7e0 net/netlink/af_netlink.c:1329 netlink_sendmsg+0x91c/0xea0 net/netlink/af_netlink.c:1918 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xd7/0x130 net/socket.c:672 __sys_sendto+0x262/0x380 net/socket.c:1998 __do_sys_sendto net/socket.c:2010 [inline] __se_sys_sendto net/socket.c:2006 [inline] __x64_sys_sendto+0xe1/0x1a0 net/socket.c:2006 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c449 Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f0feec13c78 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f0feec146d4 RCX: 000000000045c449 RDX: 0000000000010a73 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 000000000076bf20 R08: 0000000000000000 R09: 4b6ae4f95a5de35b R10: 00000000000008c0 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000a04 R14: 00000000004cc790 R15: 000000000076bf2c Modules linked in: ---[ end trace b2b28736af982a9c ]--- RIP: 0010:__list_del_entry_valid+0x22/0xf5 lib/list_debug.c:42 Code: 0e fe 48 8b 75 e8 eb b2 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 56 49 89 fe 48 83 c7 08 48 89 fa 41 55 48 c1 ea 03 41 54 <80> 3c 02 00 0f 85 a1 00 00 00 4c 89 f2 4d 8b 66 08 48 b8 00 00 00 RSP: 0018:ffffc90001837440 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: ffffffff87b5a140 RCX: ffffffff815c1ec9 RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000000008 RBP: ffffc90001837458 R08: 0000000000000004 R09: fffff52000306e7b R10: fffff52000306e7a R11: 0000000000000003 R12: 0000000000000000 R13: 0000000000000008 R14: 0000000000000000 R15: ffffffff8a98c300 FS: 00007f0feec14700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000076c000 CR3: 000000008c9e7000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400