================================================================== BUG: KASAN: slab-out-of-bounds in is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline] BUG: KASAN: slab-out-of-bounds in tc_setup_flow_action+0x870/0x3240 net/sched/cls_api.c:3625 Read of size 8 at addr ffff88813ec440c0 by task syz.4.4168/18377 CPU: 1 PID: 18377 Comm: syz.4.4168 Not tainted 5.15.189-syzkaller-android13-5.15.189_r00 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:88 dump_stack_lvl+0xee/0x150 lib/dump_stack.c:106 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:427 [inline] kasan_report+0xf1/0x140 mm/kasan/report.c:444 __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:309 is_tcf_tunnel_set include/net/tc_act/tc_tunnel_key.h:33 [inline] tc_setup_flow_action+0x870/0x3240 net/sched/cls_api.c:3625 mall_replace_hw_filter+0x293/0x820 net/sched/cls_matchall.c:100 mall_change+0x526/0x740 net/sched/cls_matchall.c:235 tc_new_tfilter+0x12a2/0x1870 net/sched/cls_api.c:2131 rtnetlink_rcv_msg+0x81b/0xb90 net/core/rtnetlink.c:5641 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x86a/0xb70 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2526 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7f7ea51a6be9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7ea3c0f038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7ea53cdfa0 RCX: 00007f7ea51a6be9 RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000008 RBP: 00007f7ea5229e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7ea53ce038 R14: 00007f7ea53cdfa0 R15: 00007fff4163a928 Allocated by task 18377: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:45 [inline] set_alloc_info mm/kasan/common.c:433 [inline] ____kasan_kmalloc mm/kasan/common.c:512 [inline] __kasan_kmalloc+0xda/0x110 mm/kasan/common.c:521 kasan_kmalloc include/linux/kasan.h:227 [inline] __kmalloc+0x13d/0x2c0 mm/slub.c:4431 kmalloc include/linux/slab.h:621 [inline] kzalloc include/linux/slab.h:747 [inline] tcf_idr_create+0x5f/0x790 net/sched/act_api.c:478 tcf_idr_create_from_flags+0x61/0x70 net/sched/act_api.c:536 tcf_gact_init+0x346/0x580 net/sched/act_gact.c:102 tcf_action_init_1+0x3f7/0x6a0 net/sched/act_api.c:1071 tcf_action_init+0x1e9/0x710 net/sched/act_api.c:1130 tcf_exts_validate+0x217/0x520 net/sched/cls_api.c:3073 mall_set_parms+0x48/0x520 net/sched/cls_matchall.c:171 mall_change+0x45a/0x740 net/sched/cls_matchall.c:229 tc_new_tfilter+0x12a2/0x1870 net/sched/cls_api.c:2131 rtnetlink_rcv_msg+0x81b/0xb90 net/core/rtnetlink.c:5641 netlink_rcv_skb+0x1e0/0x430 net/netlink/af_netlink.c:2511 rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:5668 netlink_unicast_kernel net/netlink/af_netlink.c:1322 [inline] netlink_unicast+0x876/0xa40 net/netlink/af_netlink.c:1348 netlink_sendmsg+0x86a/0xb70 net/netlink/af_netlink.c:1922 sock_sendmsg_nosec net/socket.c:704 [inline] __sock_sendmsg net/socket.c:716 [inline] ____sys_sendmsg+0x5a2/0x8c0 net/socket.c:2436 ___sys_sendmsg+0x1f0/0x260 net/socket.c:2490 __sys_sendmsg net/socket.c:2519 [inline] __do_sys_sendmsg net/socket.c:2528 [inline] __se_sys_sendmsg net/socket.c:2526 [inline] __x64_sys_sendmsg+0x1e2/0x2a0 net/socket.c:2526 x64_sys_call+0x4b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:47 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 The buggy address belongs to the object at ffff88813ec44000 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes to the right of 192-byte region [ffff88813ec44000, ffff88813ec440c0) The buggy address belongs to the page: page:ffffea0004fb1100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13ec44 flags: 0x4000000000000200(slab|zone=1) raw: 4000000000000200 0000000000000000 dead000000000122 ffff888100042c00 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 0, migratetype Unmovable, gfp_mask 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 18355, ts 1605468176809, free_ts 1597160519216 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2605 prep_new_page+0x1c/0x110 mm/page_alloc.c:2611 get_page_from_freelist+0x2cc5/0x2d50 mm/page_alloc.c:4485 __alloc_pages+0x18f/0x440 mm/page_alloc.c:5795 alloc_slab_page mm/slub.c:-1 [inline] allocate_slab mm/slub.c:1932 [inline] new_slab+0xa1/0x4d0 mm/slub.c:1995 ___slab_alloc+0x381/0x810 mm/slub.c:3028 __slab_alloc+0x49/0x90 mm/slub.c:3115 slab_alloc_node mm/slub.c:3206 [inline] slab_alloc mm/slub.c:3250 [inline] kmem_cache_alloc_trace+0x146/0x270 mm/slub.c:3267 kmalloc include/linux/slab.h:616 [inline] kzalloc include/linux/slab.h:747 [inline] io_get_sq_data io_uring/io_uring.c:8310 [inline] io_sq_offload_create io_uring/io_uring.c:8736 [inline] io_uring_create io_uring/io_uring.c:10416 [inline] io_uring_setup io_uring/io_uring.c:10502 [inline] __do_sys_io_uring_setup io_uring/io_uring.c:10508 [inline] __se_sys_io_uring_setup+0x1319/0x29a0 io_uring/io_uring.c:10505 __x64_sys_io_uring_setup+0x5b/0x70 io_uring/io_uring.c:10505 x64_sys_call+0x5f4/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:426 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 page last free stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] free_pages_prepare mm/page_alloc.c:1472 [inline] free_pcp_prepare mm/page_alloc.c:1544 [inline] free_unref_page_prepare+0x542/0x550 mm/page_alloc.c:3534 free_unref_page+0xa2/0x550 mm/page_alloc.c:3616 free_the_page mm/page_alloc.c:805 [inline] __free_pages+0x6c/0x100 mm/page_alloc.c:5871 __vunmap+0x84d/0x9e0 mm/vmalloc.c:2653 __vfree mm/vmalloc.c:2702 [inline] vfree+0x8b/0xc0 mm/vmalloc.c:2733 kcov_mmap+0x8f/0x130 kernel/kcov.c:498 call_mmap include/linux/fs.h:2217 [inline] mmap_file+0x60/0xb0 mm/util.c:1099 __mmap_region mm/mmap.c:1804 [inline] mmap_region+0xf94/0x1800 mm/mmap.c:2955 do_mmap+0x76c/0xe40 mm/mmap.c:1594 vm_mmap_pgoff+0x1ce/0x410 mm/util.c:555 ksys_mmap_pgoff+0x161/0x1d0 mm/mmap.c:1643 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:93 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __x64_sys_mmap+0xfa/0x110 arch/x86/kernel/sys_x86_64.c:86 x64_sys_call+0x83/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:10 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 Memory state around the buggy address: ffff88813ec43f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88813ec44000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88813ec44080: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ^ ffff88813ec44100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88813ec44180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================