netlink: 43036 bytes leftover after parsing attributes in process `syz-executor.4'. platform regulatory.0: Direct firmware load for regulatory.db failed with error -2 platform regulatory.0: Falling back to sysfs fallback for: regulatory.db ================================================================== BUG: KASAN: use-after-free in __list_add_valid+0x36/0xc0 lib/list_debug.c:23 Read of size 8 at addr ffff888028c5b4c8 by task syz-executor.4/29773 CPU: 0 PID: 29773 Comm: syz-executor.4 Not tainted 5.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105 print_address_description+0x66/0x3b0 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report+0x163/0x210 mm/kasan/report.c:436 __list_add_valid+0x36/0xc0 lib/list_debug.c:23 __list_add include/linux/list.h:67 [inline] list_add include/linux/list.h:86 [inline] fw_load_sysfs_fallback+0x110/0x720 drivers/base/firmware_loader/fallback.c:516 fw_load_from_user_helper+0x242/0x320 drivers/base/firmware_loader/fallback.c:581 _request_firmware+0x3b4/0x560 drivers/base/firmware_loader/main.c:833 request_firmware+0x35/0x50 drivers/base/firmware_loader/main.c:877 reg_reload_regdb+0x81/0x200 net/wireless/reg.c:1095 genl_family_rcv_msg_doit net/netlink/genetlink.c:739 [inline] genl_family_rcv_msg net/netlink/genetlink.c:783 [inline] genl_rcv_msg+0xfb4/0x13c0 net/netlink/genetlink.c:800 netlink_rcv_skb+0x1f0/0x460 net/netlink/af_netlink.c:2504 genl_rcv+0x24/0x40 net/netlink/genetlink.c:811 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x7de/0x9b0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x9e7/0xe00 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg net/socket.c:723 [inline] ____sys_sendmsg+0x5a2/0x900 net/socket.c:2392 ___sys_sendmsg net/socket.c:2446 [inline] __sys_sendmsg+0x319/0x400 net/socket.c:2475 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665e9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9718353188 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000003 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffeb09371df R14: 00007f9718353300 R15: 0000000000022000 Allocated by task 29785: 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+0xc4/0xf0 mm/kasan/common.c:513 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x96/0x340 mm/slub.c:2983 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] smk_fetch security/smack/smack_lsm.c:288 [inline] smack_d_instantiate+0x946/0xd00 security/smack/smack_lsm.c:3445 security_d_instantiate+0xa5/0x100 security/security.c:2038 d_instantiate_new+0x61/0x110 fs/dcache.c:2027 ext4_add_nondir+0x22b/0x290 fs/ext4/namei.c:2706 ext4_symlink+0x9ce/0x1000 fs/ext4/namei.c:3535 vfs_symlink+0x396/0x530 fs/namei.c:4182 do_symlinkat+0x251/0x510 fs/namei.c:4212 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Freed by task 29785: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:46 kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360 ____kasan_slab_free+0x109/0x150 mm/kasan/common.c:366 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1625 [inline] slab_free_freelist_hook+0x1d8/0x290 mm/slub.c:1650 slab_free mm/slub.c:3210 [inline] kfree+0xd0/0x1f0 mm/slub.c:4264 smk_fetch security/smack/smack_lsm.c:300 [inline] smack_d_instantiate+0x9da/0xd00 security/smack/smack_lsm.c:3445 security_d_instantiate+0xa5/0x100 security/security.c:2038 d_instantiate_new+0x61/0x110 fs/dcache.c:2027 ext4_add_nondir+0x22b/0x290 fs/ext4/namei.c:2706 ext4_symlink+0x9ce/0x1000 fs/ext4/namei.c:3535 vfs_symlink+0x396/0x530 fs/namei.c:4182 do_symlinkat+0x251/0x510 fs/namei.c:4212 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x27/0x50 mm/kasan/common.c:38 kasan_record_aux_stack+0xee/0x120 mm/kasan/generic.c:348 kvfree_call_rcu+0x114/0x8a0 kernel/rcu/tree.c:3594 br_multicast_gc net/bridge/br_multicast.c:691 [inline] br_multicast_gc_work+0x253/0x2b0 net/bridge/br_multicast.c:3472 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888028c5b400 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 200 bytes inside of 256-byte region [ffff888028c5b400, ffff888028c5b500) The buggy address belongs to the page: page:ffffea0000a31680 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28c5a head:ffffea0000a31680 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea000085c800 0000000600000006 ffff888011041b40 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 26, ts 168188582611, free_ts 164774374056 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0x779/0xa30 mm/page_alloc.c:4169 __alloc_pages+0x26c/0x5f0 mm/page_alloc.c:5391 alloc_slab_page mm/slub.c:1688 [inline] allocate_slab+0xf1/0x540 mm/slub.c:1828 new_slab mm/slub.c:1891 [inline] new_slab_objects mm/slub.c:2637 [inline] ___slab_alloc+0x1cf/0x350 mm/slub.c:2800 __slab_alloc mm/slub.c:2840 [inline] slab_alloc_node mm/slub.c:2922 [inline] slab_alloc mm/slub.c:2964 [inline] __kmalloc+0x2e7/0x390 mm/slub.c:4108 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] fib6_info_alloc+0x2c/0xd0 net/ipv6/ip6_fib.c:155 ip6_route_info_create+0x507/0x1a50 net/ipv6/route.c:3762 ip6_route_add+0x22/0x120 net/ipv6/route.c:3856 addrconf_add_mroute net/ipv6/addrconf.c:2479 [inline] addrconf_add_dev+0x43c/0x620 net/ipv6/addrconf.c:2497 addrconf_dev_config+0x142/0x390 net/ipv6/addrconf.c:3351 addrconf_notify+0x17ae/0x2110 net/ipv6/addrconf.c:3593 notifier_call_chain kernel/notifier.c:83 [inline] raw_notifier_call_chain+0xe7/0x170 kernel/notifier.c:410 call_netdevice_notifiers_info net/core/dev.c:2123 [inline] netdev_state_change+0x19b/0x260 net/core/dev.c:1514 linkwatch_do_dev+0x10a/0x190 net/core/link_watch.c:167 __linkwatch_run_queue+0x49f/0x7b0 net/core/link_watch.c:212 linkwatch_event+0x48/0x50 net/core/link_watch.c:251 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1346 [inline] free_pcp_prepare+0xc29/0xd20 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x7e/0x550 mm/page_alloc.c:3411 __vunmap+0x926/0xa70 mm/vmalloc.c:2587 free_work+0x66/0x90 mm/vmalloc.c:82 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276 worker_thread+0xac1/0x1320 kernel/workqueue.c:2422 kthread+0x453/0x480 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888028c5b380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888028c5b400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888028c5b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888028c5b500: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888028c5b580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================