================================================================== 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 ffff888033f32ec0 by task syz-executor.1/11740 CPU: 0 PID: 11740 Comm: syz-executor.1 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/0x309 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:00007fd46d9f2188 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665e9 RDX: 0000000000000000 RSI: 0000000020000140 RDI: ffffffffffffff9c RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff7eaceebf R14: 00007fd46d9f2300 R15: 0000000000022000 Allocated by task 11642: 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+0x9b/0xd0 mm/kasan/common.c:522 kmalloc_array include/linux/slab.h:631 [inline] kcalloc include/linux/slab.h:660 [inline] __list_lru_init+0xce/0x920 mm/list_lru.c:596 alloc_super+0x8a2/0xab0 fs/super.c:274 sget_fc+0x13e/0x7c0 fs/super.c:531 get_tree_bdev+0x1bb/0x760 fs/super.c:1263 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount fs/namespace.c:3433 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433 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 Freed by task 11642: kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:360 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xfb/0x130 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1625 [inline] slab_free_freelist_hook+0xdf/0x240 mm/slub.c:1650 slab_free mm/slub.c:3210 [inline] kfree+0xe4/0x530 mm/slub.c:4264 list_lru_destroy mm/list_lru.c:633 [inline] list_lru_destroy+0x3a5/0x4f0 mm/list_lru.c:622 deactivate_locked_super+0xac/0x160 fs/super.c:343 get_tree_bdev+0x573/0x760 fs/super.c:1295 vfs_get_tree+0x89/0x2f0 fs/super.c:1498 do_new_mount fs/namespace.c:2905 [inline] path_mount+0x132a/0x1fa0 fs/namespace.c:3235 do_mount fs/namespace.c:3248 [inline] __do_sys_mount fs/namespace.c:3456 [inline] __se_sys_mount fs/namespace.c:3433 [inline] __x64_sys_mount+0x27f/0x300 fs/namespace.c:3433 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+0xe5/0x110 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] ip6_route_info_create+0x16bb/0x1aa0 net/ipv6/route.c:3842 ip6_route_add+0x24/0x150 net/ipv6/route.c:3856 addrconf_add_mroute+0x1e1/0x310 net/ipv6/addrconf.c:2479 addrconf_add_dev+0x162/0x1d0 net/ipv6/addrconf.c:2497 inet6_addr_add+0x1a4/0xae0 net/ipv6/addrconf.c:2913 inet6_rtm_newaddr+0xf00/0x1970 net/ipv6/addrconf.c:4871 rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5574 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2504 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 __sys_sendto+0x21c/0x320 net/socket.c:2019 __do_sys_sendto net/socket.c:2031 [inline] __se_sys_sendto net/socket.c:2027 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2027 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 The buggy address belongs to the object at ffff888033f32e00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 192 bytes inside of 256-byte region [ffff888033f32e00, ffff888033f32f00) The buggy address belongs to the page: page:ffffea0000cfcc80 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x33f32 head:ffffea0000cfcc80 order:1 compound_mapcount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000010200 ffffea0001f1c180 0000000600000005 ffff888010841b40 raw: 0000000000000000 0000000080100010 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 8470, ts 176624266863, free_ts 176354506834 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+0x18c/0x2a0 mm/mempolicy.c:2244 alloc_slab_page mm/slub.c:1688 [inline] allocate_slab+0x32e/0x4b0 mm/slub.c:1828 new_slab mm/slub.c:1891 [inline] new_slab_objects mm/slub.c:2637 [inline] ___slab_alloc+0x4ba/0x820 mm/slub.c:2800 __slab_alloc.constprop.0+0xa7/0xf0 mm/slub.c:2840 slab_alloc_node mm/slub.c:2922 [inline] slab_alloc mm/slub.c:2964 [inline] __kmalloc+0x312/0x330 mm/slub.c:4108 kmalloc include/linux/slab.h:596 [inline] kzalloc include/linux/slab.h:721 [inline] fib_create_info+0x8a7/0x4890 net/ipv4/fib_semantics.c:1419 fib_table_insert+0x1cd/0x1af0 net/ipv4/fib_trie.c:1224 fib_magic+0x455/0x540 net/ipv4/fib_frontend.c:1087 fib_add_ifaddr+0x16c/0x500 net/ipv4/fib_frontend.c:1109 fib_netdev_event+0x46f/0x680 net/ipv4/fib_frontend.c:1466 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_notify_flags+0x110/0x2b0 net/core/dev.c:8860 dev_change_flags+0x112/0x170 net/core/dev.c:8898 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 unfreeze_partials+0x17c/0x1d0 mm/slub.c:2418 put_cpu_partial+0x13d/0x230 mm/slub.c:2454 qlink_free mm/kasan/quarantine.c:146 [inline] qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272 __kasan_slab_alloc+0x8e/0xa0 mm/kasan/common.c:444 kasan_slab_alloc include/linux/kasan.h:254 [inline] slab_post_alloc_hook mm/slab.h:519 [inline] slab_alloc_node mm/slub.c:2956 [inline] kmem_cache_alloc_node+0x266/0x3e0 mm/slub.c:2992 __alloc_skb+0x20b/0x340 net/core/skbuff.c:414 alloc_skb include/linux/skbuff.h:1112 [inline] nlmsg_new include/net/netlink.h:953 [inline] netlink_ack+0x1f0/0xa60 net/netlink/af_netlink.c:2439 netlink_rcv_skb+0x33d/0x420 net/netlink/af_netlink.c:2510 netlink_unicast_kernel net/netlink/af_netlink.c:1314 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1340 netlink_sendmsg+0x86d/0xdb0 net/netlink/af_netlink.c:1929 sock_sendmsg_nosec net/socket.c:703 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:723 __sys_sendto+0x21c/0x320 net/socket.c:2019 __do_sys_sendto net/socket.c:2031 [inline] __se_sys_sendto net/socket.c:2027 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2027 Memory state around the buggy address: ffff888033f32d80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888033f32e00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff888033f32e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888033f32f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888033f32f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================