================================================================== BUG: KASAN: null-ptr-deref in generic_hwtstamp_ioctl_lower+0x168/0x274 net/core/dev_ioctl.c:447 Read of size 24 at addr 0000000000000010 by task syz.1.11/6630 CPU: 1 UID: 0 PID: 6630 Comm: syz.1.11 Not tainted 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:466 (C) __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_report+0x58/0x84 mm/kasan/report.c:524 kasan_report+0xb0/0x110 mm/kasan/report.c:634 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:189 __asan_memcpy+0x3c/0x84 mm/kasan/shadow.c:105 generic_hwtstamp_ioctl_lower+0x168/0x274 net/core/dev_ioctl.c:447 generic_hwtstamp_get_lower+0xc4/0xdc net/core/dev_ioctl.c:471 vlan_hwtstamp_get+0x48/0x58 net/8021q/vlan_dev.c:342 dev_get_hwtstamp_phylib+0x2ac/0x494 net/core/dev_ioctl.c:-1 tsconfig_prepare_data+0x128/0x534 net/ethtool/tsconfig.c:51 ethnl_default_dump_one net/ethtool/netlink.c:559 [inline] ethnl_default_dumpit+0x4fc/0xc38 net/ethtool/netlink.c:595 genl_dumpit+0x100/0x1b4 net/netlink/genetlink.c:1027 netlink_dump+0x4f0/0xbc0 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x4cc/0x72c net/netlink/af_netlink.c:2424 genl_family_rcv_msg_dumpit+0x184/0x250 net/netlink/genetlink.c:1076 genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline] genl_rcv_msg+0x418/0x624 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x230/0x414 net/netlink/af_netlink.c:2534 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x60c/0x824 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x648/0x930 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0x490/0x7b8 net/socket.c:2566 ___sys_sendmsg+0x204/0x278 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __arm64_sys_sendmsg+0x184/0x238 net/socket.c:2655 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 ================================================================== Unable to handle kernel NULL pointer dereference at virtual address 0000000000000010 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006, ISS2 = 0x00000000 CM = 0, WnR = 0, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=0000000111d43000 [0000000000000010] pgd=0800000112926403, p4d=0800000112926403, pud=0800000115879403, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 6630 Comm: syz.1.11 Tainted: G B 6.15.0-rc7-syzkaller-gd7fa1af5b33e #0 PREEMPT Tainted: [B]=BAD_PAGE Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 pstate: 20400005 (nzCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __pi_memcpy_generic+0x24/0x22c arch/arm64/lib/memcpy.S:71 lr : __asan_memcpy+0x68/0x84 mm/kasan/shadow.c:109 sp : ffff8000a1586bd0 x29: ffff8000a1586bd0 x28: ffff0000f4d2d648 x27: ffff0000d567f128 x26: 1ffff000142b0db6 x25: dfff800000000000 x24: ffff7000142b0d80 x23: ffff8000a1586db0 x22: ffff80008919dd80 x21: ffff8000a1586c30 x20: 0000000000000010 x19: 0000000000000018 x18: 00000000ffffffff x17: 0000000000000000 x16: ffff80008ad27e48 x15: 0000000000000003 x14: 1ffff000142b0d86 x13: 0000000000000000 x12: 0000000000000000 x11: ffff7000142b0d89 x10: dfff800000000000 x9 : 1ffff000142b0d88 x8 : 0000000000000001 x7 : 0000000000000000 x6 : ffff80008911ea70 x5 : ffff8000a1586c48 x4 : 0000000000000028 x3 : ffff80008919dd80 x2 : 0000000000000018 x1 : 0000000000000010 x0 : ffff8000a1586c30 Call trace: __pi_memcpy_generic+0x24/0x22c arch/arm64/lib/memcpy.S:70 (P) generic_hwtstamp_ioctl_lower+0x168/0x274 net/core/dev_ioctl.c:447 generic_hwtstamp_get_lower+0xc4/0xdc net/core/dev_ioctl.c:471 vlan_hwtstamp_get+0x48/0x58 net/8021q/vlan_dev.c:342 dev_get_hwtstamp_phylib+0x2ac/0x494 net/core/dev_ioctl.c:-1 tsconfig_prepare_data+0x128/0x534 net/ethtool/tsconfig.c:51 ethnl_default_dump_one net/ethtool/netlink.c:559 [inline] ethnl_default_dumpit+0x4fc/0xc38 net/ethtool/netlink.c:595 genl_dumpit+0x100/0x1b4 net/netlink/genetlink.c:1027 netlink_dump+0x4f0/0xbc0 net/netlink/af_netlink.c:2309 __netlink_dump_start+0x4cc/0x72c net/netlink/af_netlink.c:2424 genl_family_rcv_msg_dumpit+0x184/0x250 net/netlink/genetlink.c:1076 genl_family_rcv_msg net/netlink/genetlink.c:1192 [inline] genl_rcv_msg+0x418/0x624 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x230/0x414 net/netlink/af_netlink.c:2534 genl_rcv+0x38/0x50 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x60c/0x824 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x648/0x930 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0x490/0x7b8 net/socket.c:2566 ___sys_sendmsg+0x204/0x278 net/socket.c:2620 __sys_sendmsg net/socket.c:2652 [inline] __do_sys_sendmsg net/socket.c:2657 [inline] __se_sys_sendmsg net/socket.c:2655 [inline] __arm64_sys_sendmsg+0x184/0x238 net/socket.c:2655 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x58/0x17c arch/arm64/kernel/entry-common.c:767 el0t_64_sync_handler+0x78/0x108 arch/arm64/kernel/entry-common.c:786 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Code: f100805f 540003c8 f100405f 540000c3 (a9401c26) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: f100805f cmp x2, #0x20 4: 540003c8 b.hi 0x7c // b.pmore 8: f100405f cmp x2, #0x10 c: 540000c3 b.cc 0x24 // b.lo, b.ul, b.last * 10: a9401c26 ldp x6, x7, [x1] <-- trapping instruction