================================================================== BUG: KASAN: use-after-free in dev_map_enqueue+0x48/0x1ec kernel/bpf/devmap.c:531 Read of size 8 at addr ffff0000c8f02c00 by task kworker/1:5/4074 CPU: 1 PID: 4074 Comm: kworker/1:5 Not tainted 5.15.179-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: mld mld_ifc_work Call trace: dump_backtrace+0x0/0x530 arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description+0x7c/0x3f0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0x174/0x1e4 mm/kasan/report.c:451 __asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309 dev_map_enqueue+0x48/0x1ec kernel/bpf/devmap.c:531 __xdp_do_redirect_frame net/core/filter.c:4089 [inline] xdp_do_redirect+0x4bc/0xd64 net/core/filter.c:4129 veth_xdp_rcv_skb drivers/net/veth.c:798 [inline] veth_xdp_rcv drivers/net/veth.c:883 [inline] veth_poll+0x1658/0x3a84 drivers/net/veth.c:919 __napi_poll+0xb4/0x624 net/core/dev.c:7074 napi_poll net/core/dev.c:7141 [inline] net_rx_action+0x500/0xc10 net/core/dev.c:7231 handle_softirqs+0x384/0xdbc kernel/softirq.c:558 __do_softirq kernel/softirq.c:592 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] do_softirq+0xfc/0x1b0 kernel/softirq.c:459 __local_bh_enable_ip+0x298/0x470 kernel/softirq.c:383 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline] ip6_finish_output2+0x1400/0x1cec net/ipv6/ip6_output.c:131 __ip6_finish_output+0x580/0x6ec net/ipv6/ip6_output.c:201 ip6_finish_output+0x40/0x218 net/ipv6/ip6_output.c:211 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x274/0x594 net/ipv6/ip6_output.c:234 dst_output include/net/dst.h:452 [inline] NF_HOOK+0x160/0x4ec include/linux/netfilter.h:302 mld_sendpack+0x82c/0x1268 net/ipv6/mcast.c:1826 mld_send_cr net/ipv6/mcast.c:2127 [inline] mld_ifc_work+0x798/0xa3c net/ipv6/mcast.c:2659 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310 worker_thread+0x910/0x1034 kernel/workqueue.c:2457 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Allocated by task 6640: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc+0xbc/0xfc mm/kasan/common.c:513 __kasan_kmalloc+0x10/0x1c mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x27c/0x47c mm/slub.c:3247 kmalloc include/linux/slab.h:591 [inline] single_open+0x6c/0x248 fs/seq_file.c:591 proc_single_open+0x84/0x98 fs/proc/generic.c:636 proc_reg_open+0x1bc/0x4b8 fs/proc/inode.c:524 do_dentry_open+0x780/0xed8 fs/open.c:826 vfs_open+0x7c/0x90 fs/open.c:956 do_open fs/namei.c:3608 [inline] path_openat+0x1ea0/0x26cc fs/namei.c:3742 do_filp_open+0x1a8/0x3b4 fs/namei.c:3769 do_sys_openat2+0x128/0x3e0 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1280 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x7c/0x1f0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0x84/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000c8f02c00 which belongs to the cache kmalloc-cg-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff0000c8f02c00, ffff0000c8f02c80) The buggy address belongs to the page: page:0000000062783a11 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x108f02 memcg:ffff0000c2c0ac01 flags: 0x5ffc00000000200(slab|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000000200 dead000000000100 dead000000000122 ffff0000c0002d80 raw: 0000000000000000 0000000080100010 00000001ffffffff ffff0000c2c0ac01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c8f02b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c8f02b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000c8f02c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c8f02c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c8f02d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ================================================================== Unable to handle kernel paging request at virtual address dfff800000000047 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 CM = 0, WnR = 0 [dfff800000000047] address between user and kernel address ranges Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 4074 Comm: kworker/1:5 Tainted: G B 5.15.179-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025 Workqueue: mld mld_ifc_work pstate: 00400005 (nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __xdp_enqueue kernel/bpf/devmap.c:480 [inline] pc : dev_map_enqueue+0x88/0x1ec kernel/bpf/devmap.c:533 lr : __xdp_enqueue kernel/bpf/devmap.c:480 [inline] lr : dev_map_enqueue+0x7c/0x1ec kernel/bpf/devmap.c:533 sp : ffff80001fda6cd0 x29: ffff80001fda6ce0 x28: dfff800000000000 x27: ffff0001b41a66d0 x26: ffff0001b41a66d4 x25: ffff0000c259a000 x24: dfff800000000000 x23: 0000000000000238 x22: 0000000000000000 x21: ffff0000c231a930 x20: ffff0000c259a000 x19: ffff0000cd95a000 x18: 0000000000000103 x17: 0000000000000000 x16: ffff80000824f3a0 x15: 00000000ffffffff x14: ffff0000c22b9b40 x13: 0000000000000001 x12: ffff700002e3ad64 x11: 0000000000000101 x10: 0000000000000000 x9 : ffff80001b849390 x8 : 0000000000000047 x7 : 0000000000000000 x6 : 0000000000000001 x5 : ffff80001fda6378 x4 : 0000000000000000 x3 : ffff80000864c0f4 x2 : 0000000000000000 x1 : 0000000000000008 x0 : 0000000000000000 Call trace: __xdp_enqueue kernel/bpf/devmap.c:480 [inline] dev_map_enqueue+0x88/0x1ec kernel/bpf/devmap.c:533 __xdp_do_redirect_frame net/core/filter.c:4089 [inline] xdp_do_redirect+0x4bc/0xd64 net/core/filter.c:4129 veth_xdp_rcv_skb drivers/net/veth.c:798 [inline] veth_xdp_rcv drivers/net/veth.c:883 [inline] veth_poll+0x1658/0x3a84 drivers/net/veth.c:919 __napi_poll+0xb4/0x624 net/core/dev.c:7074 napi_poll net/core/dev.c:7141 [inline] net_rx_action+0x500/0xc10 net/core/dev.c:7231 handle_softirqs+0x384/0xdbc kernel/softirq.c:558 __do_softirq kernel/softirq.c:592 [inline] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] do_softirq+0xfc/0x1b0 kernel/softirq.c:459 __local_bh_enable_ip+0x298/0x470 kernel/softirq.c:383 local_bh_enable+0x28/0x34 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:809 [inline] ip6_finish_output2+0x1400/0x1cec net/ipv6/ip6_output.c:131 __ip6_finish_output+0x580/0x6ec net/ipv6/ip6_output.c:201 ip6_finish_output+0x40/0x218 net/ipv6/ip6_output.c:211 NF_HOOK_COND include/linux/netfilter.h:291 [inline] ip6_output+0x274/0x594 net/ipv6/ip6_output.c:234 dst_output include/net/dst.h:452 [inline] NF_HOOK+0x160/0x4ec include/linux/netfilter.h:302 mld_sendpack+0x82c/0x1268 net/ipv6/mcast.c:1826 mld_send_cr net/ipv6/mcast.c:2127 [inline] mld_ifc_work+0x798/0xa3c net/ipv6/mcast.c:2659 process_one_work+0x790/0x11b8 kernel/workqueue.c:2310 worker_thread+0x910/0x1034 kernel/workqueue.c:2457 kthread+0x37c/0x45c kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:870 Code: 940a2f16 f94002e8 9108e117 d343fee8 (38786908) ---[ end trace b3434fcf658b3da8 ]--- ---------------- Code disassembly (best guess): 0: 940a2f16 bl 0x28bc58 4: f94002e8 ldr x8, [x23] 8: 9108e117 add x23, x8, #0x238 c: d343fee8 lsr x8, x23, #3 * 10: 38786908 ldrb w8, [x8, x24] <-- trapping instruction