loop4: detected capacity change from 0 to 32768 BTRFS: device fsid 395ef67a-297e-477c-816d-cd80a5b93e5d devid 1 transid 8 /dev/loop4 scanned by syz-executor.4 (8834) ================================================================== BUG: KASAN: use-after-free in btrfs_test_super+0x5b/0x90 fs/btrfs/super.c:1348 Read of size 8 at addr ffff888043315110 by task syz-executor.4/8834 CPU: 1 PID: 8834 Comm: syz-executor.4 Not tainted 6.5.0-syzkaller-01207-g1c59d383390f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0x163/0x540 mm/kasan/report.c:475 kasan_report+0x175/0x1b0 mm/kasan/report.c:588 btrfs_test_super+0x5b/0x90 fs/btrfs/super.c:1348 sget+0x127/0x4d0 fs/super.c:861 btrfs_mount_root+0x5ec/0x910 fs/btrfs/super.c:1508 legacy_get_tree+0xef/0x190 fs/fs_context.c:638 vfs_get_tree+0x8c/0x280 fs/super.c:1711 fc_mount fs/namespace.c:1112 [inline] vfs_kern_mount+0xbc/0x150 fs/namespace.c:1142 btrfs_mount+0x39f/0xb50 fs/btrfs/super.c:1585 legacy_get_tree+0xef/0x190 fs/fs_context.c:638 vfs_get_tree+0x8c/0x280 fs/super.c:1711 do_new_mount+0x28f/0xae0 fs/namespace.c:3335 do_mount fs/namespace.c:3675 [inline] __do_sys_mount fs/namespace.c:3884 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc9b027e1ea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc9b1027ee8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fc9b1027f80 RCX: 00007fc9b027e1ea RDX: 0000000020000000 RSI: 0000000020005600 RDI: 00007fc9b1027f40 RBP: 0000000020000000 R08: 00007fc9b1027f80 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020005600 R13: 00007fc9b1027f40 R14: 000000000000559e R15: 0000000020001380 The buggy address belongs to the physical page: page:ffffea00010cc540 refcount:1 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x43315 head:ffffea00010cc500 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000000 ffffea00010cc501 ffffffff00000201 0000000000000000 raw: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 head: 00fff00000010200 ffff888141e5c780 dead000000000122 0000000000000000 head: 0000000000000000 0000000080150015 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0x1f2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_MEMALLOC|__GFP_HARDWALL), pid 5061, tgid 5061 (syz-executor.5), ts 290125009305, free_ts 289767468162 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1570 prep_new_page mm/page_alloc.c:1577 [inline] get_page_from_freelist+0x31e8/0x3370 mm/page_alloc.c:3221 __alloc_pages+0x255/0x670 mm/page_alloc.c:4477 alloc_slab_page+0x6a/0x160 mm/slub.c:1862 allocate_slab mm/slub.c:2009 [inline] new_slab+0x84/0x2f0 mm/slub.c:2062 ___slab_alloc+0xade/0x1100 mm/slub.c:3215 __slab_alloc mm/slub.c:3314 [inline] __slab_alloc_node mm/slub.c:3367 [inline] slab_alloc_node mm/slub.c:3460 [inline] kmem_cache_alloc_node+0x1e2/0x330 mm/slub.c:3515 kmalloc_reserve+0x8a/0x240 net/core/skbuff.c:559 __alloc_skb+0x1b1/0x420 net/core/skbuff.c:644 __netdev_alloc_skb+0x105/0x520 net/core/skbuff.c:708 netdev_alloc_skb include/linux/skbuff.h:3212 [inline] dev_alloc_skb include/linux/skbuff.h:3225 [inline] __ieee80211_beacon_get+0x909/0x14f0 net/mac80211/tx.c:5425 ieee80211_beacon_get_tim+0xbd/0x5b0 net/mac80211/tx.c:5547 ieee80211_beacon_get include/net/mac80211.h:5418 [inline] mac80211_hwsim_beacon_tx+0x382/0x750 drivers/net/wireless/virtual/mac80211_hwsim.c:2261 __iterate_interfaces+0x21e/0x4b0 net/mac80211/util.c:766 ieee80211_iterate_active_interfaces_atomic+0xb3/0x140 net/mac80211/util.c:802 mac80211_hwsim_beacon+0xd4/0x1e0 drivers/net/wireless/virtual/mac80211_hwsim.c:2291 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1161 [inline] free_unref_page_prepare+0x903/0xa30 mm/page_alloc.c:2348 free_unref_page+0x37/0x3f0 mm/page_alloc.c:2443 free_large_kmalloc+0xff/0x190 mm/slab_common.c:962 deactivate_locked_super+0xa5/0x200 fs/super.c:454 cleanup_mnt+0x426/0x4c0 fs/namespace.c:1254 task_work_run+0x24a/0x300 kernel/task_work.c:179 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] exit_to_user_mode_loop+0xd9/0x100 kernel/entry/common.c:171 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:204 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x64/0x280 kernel/entry/common.c:296 do_syscall_64+0x4d/0xc0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd Memory state around the buggy address: ffff888043315000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888043315080: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888043315100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff888043315180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888043315200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================