================================================================== BUG: KASAN: use-after-free in kill_pending_fw_fallback_reqs+0x2fb/0x370 drivers/base/firmware_loader/fallback.c:116 Read of size 8 at addr ffff888029c568c0 by task syz-executor.2/32135 CPU: 1 PID: 32135 Comm: syz-executor.2 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+0xcd/0x134 lib/dump_stack.c:105 print_address_description.constprop.0.cold+0x6c/0x2d6 mm/kasan/report.c:233 __kasan_report mm/kasan/report.c:419 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 kill_pending_fw_fallback_reqs+0x2fb/0x370 drivers/base/firmware_loader/fallback.c:116 fw_pm_notify+0xa2/0x140 drivers/base/firmware_loader/main.c:1450 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 notifier_call_chain_robust kernel/notifier.c:118 [inline] blocking_notifier_call_chain_robust kernel/notifier.c:302 [inline] blocking_notifier_call_chain_robust+0xc4/0x160 kernel/notifier.c:290 pm_notifier_call_chain_robust+0x26/0x60 kernel/power/main.c:87 snapshot_open+0x190/0x2a0 kernel/power/user.c:75 misc_open+0x372/0x4a0 drivers/char/misc.c:141 chrdev_open+0x266/0x770 fs/char_dev.c:414 do_dentry_open+0x4c8/0x11d0 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x1c23/0x27f0 fs/namei.c:3507 do_filp_open+0x1aa/0x400 fs/namei.c:3534 do_sys_openat2+0x16d/0x420 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1231 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 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:00007f2281c17188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000020000980 RDI: ffffffffffffff9c RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe891794cf R14: 00007f2281c17300 R15: 0000000000022000 Allocated by task 30012: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0x98/0xc0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] __do_kmalloc mm/slab.c:3702 [inline] __kmalloc+0x214/0x4d0 mm/slab.c:3711 kmalloc_array+0x42/0x70 include/linux/slab.h:631 kcalloc include/linux/slab.h:660 [inline] iter_file_splice_write+0x13f/0xc10 fs/splice.c:628 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x110/0x180 fs/splice.c:936 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891 do_splice_direct+0x1b3/0x280 fs/splice.c:979 do_sendfile+0x9f0/0x1120 fs/read_write.c:1260 __do_sys_sendfile64 fs/read_write.c:1325 [inline] __se_sys_sendfile64 fs/read_write.c:1311 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1311 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:348 kvfree_call_rcu+0x74/0x990 kernel/rcu/tree.c:3594 drop_sysctl_table+0x3c0/0x4e0 fs/proc/proc_sysctl.c:1647 unregister_sysctl_table fs/proc/proc_sysctl.c:1685 [inline] unregister_sysctl_table+0xc2/0x190 fs/proc/proc_sysctl.c:1660 mpls_dev_sysctl_unregister net/mpls/af_mpls.c:1441 [inline] mpls_dev_notify+0x44e/0x8e0 net/mpls/af_mpls.c:1621 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2123 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline] call_netdevice_notifiers net/core/dev.c:2149 [inline] unregister_netdevice_many+0x951/0x1790 net/core/dev.c:11093 unregister_netdevice_queue+0x2dd/0x3c0 net/core/dev.c:11027 unregister_netdevice include/linux/netdevice.h:2969 [inline] ser_release+0x17f/0x270 drivers/net/caif/caif_serial.c:310 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Second to last potentially related work creation: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_record_aux_stack+0xa4/0xd0 mm/kasan/generic.c:348 __call_rcu kernel/rcu/tree.c:3029 [inline] call_rcu+0xb1/0x750 kernel/rcu/tree.c:3109 fib6_info_release include/net/ip6_fib.h:337 [inline] fib6_info_release include/net/ip6_fib.h:334 [inline] fib6_del_route net/ipv6/ip6_fib.c:1995 [inline] fib6_del+0x11d7/0x15d0 net/ipv6/ip6_fib.c:2028 fib6_clean_node+0x393/0x5c0 net/ipv6/ip6_fib.c:2190 fib6_walk_continue+0x400/0x720 net/ipv6/ip6_fib.c:2112 fib6_walk+0x182/0x370 net/ipv6/ip6_fib.c:2160 fib6_clean_tree+0xdb/0x120 net/ipv6/ip6_fib.c:2240 __fib6_clean_all+0x107/0x2a0 net/ipv6/ip6_fib.c:2256 rt6_sync_down_dev net/ipv6/route.c:4896 [inline] rt6_disable_ip+0x834/0x930 net/ipv6/route.c:4901 addrconf_ifdown.isra.0+0xf6/0x15b0 net/ipv6/addrconf.c:3706 addrconf_notify+0x606/0x2400 net/ipv6/addrconf.c:3631 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:2123 call_netdevice_notifiers_extack net/core/dev.c:2135 [inline] call_netdevice_notifiers net/core/dev.c:2149 [inline] dev_close_many+0x2ff/0x620 net/core/dev.c:1724 unregister_netdevice_many+0x3ff/0x1790 net/core/dev.c:11070 default_device_exit_batch+0x2fa/0x3c0 net/core/dev.c:11623 ops_exit_list+0x10d/0x160 net/core/net_namespace.c:178 cleanup_net+0x4ea/0xb10 net/core/net_namespace.c:595 process_one_work+0x98d/0x1630 kernel/workqueue.c:2276 worker_thread+0x658/0x11f0 kernel/workqueue.c:2422 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 The buggy address belongs to the object at ffff888029c56800 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 192 bytes inside of 256-byte region [ffff888029c56800, ffff888029c56900) The buggy address belongs to the page: page:ffffea0000a71580 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888029c56800 pfn:0x29c56 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea0000782308 ffffea0001ad0748 ffff888010840500 raw: ffff888029c56800 ffff888029c56000 0000000100000007 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 0x242040(__GFP_IO|__GFP_NOWARN|__GFP_COMP|__GFP_THISNODE), pid 8573, ts 128820082015, free_ts 128820064332 prep_new_page mm/page_alloc.c:2436 [inline] get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4169 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5391 __alloc_pages_node include/linux/gfp.h:570 [inline] kmem_getpages mm/slab.c:1377 [inline] cache_grow_begin+0x75/0x460 mm/slab.c:2593 cache_alloc_refill+0x27f/0x380 mm/slab.c:2965 ____cache_alloc mm/slab.c:3048 [inline] ____cache_alloc mm/slab.c:3031 [inline] __do_cache_alloc mm/slab.c:3275 [inline] slab_alloc mm/slab.c:3316 [inline] kmem_cache_alloc_trace+0x38c/0x480 mm/slab.c:3573 kmalloc include/linux/slab.h:591 [inline] inode_doinit_use_xattr+0x54/0x340 security/selinux/hooks.c:1389 inode_doinit_with_dentry+0x10ec/0x12e0 security/selinux/hooks.c:1580 selinux_d_instantiate+0x23/0x30 security/selinux/hooks.c:6444 security_d_instantiate+0x50/0xe0 security/security.c:2038 d_splice_alias+0x8c/0xc60 fs/dcache.c:3064 kernfs_iop_lookup+0x1ac/0x220 fs/kernfs/dir.c:1107 __lookup_slow+0x24c/0x480 fs/namei.c:1646 lookup_slow fs/namei.c:1663 [inline] walk_component+0x40f/0x6a0 fs/namei.c:1959 link_path_walk.part.0+0x757/0xd00 fs/namei.c:2286 link_path_walk fs/namei.c:2211 [inline] path_openat+0x260/0x27f0 fs/namei.c:3503 do_filp_open+0x1aa/0x400 fs/namei.c:3534 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+0x2c5/0x780 mm/page_alloc.c:1397 free_unref_page_prepare mm/page_alloc.c:3332 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3411 selinux_genfs_get_sid security/selinux/hooks.c:1376 [inline] inode_doinit_with_dentry+0x868/0x12e0 security/selinux/hooks.c:1571 selinux_d_instantiate+0x23/0x30 security/selinux/hooks.c:6444 security_d_instantiate+0x50/0xe0 security/security.c:2038 d_splice_alias+0x8c/0xc60 fs/dcache.c:3064 kernfs_iop_lookup+0x1ac/0x220 fs/kernfs/dir.c:1107 __lookup_slow+0x24c/0x480 fs/namei.c:1646 lookup_slow fs/namei.c:1663 [inline] walk_component+0x40f/0x6a0 fs/namei.c:1959 link_path_walk.part.0+0x757/0xd00 fs/namei.c:2286 link_path_walk fs/namei.c:2211 [inline] path_openat+0x260/0x27f0 fs/namei.c:3503 do_filp_open+0x1aa/0x400 fs/namei.c:3534 do_sys_openat2+0x16d/0x420 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_openat fs/open.c:1236 [inline] __se_sys_openat fs/open.c:1231 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1231 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae Memory state around the buggy address: ffff888029c56780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888029c56800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888029c56880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888029c56900: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888029c56980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================