syz-executor.4: attempt to access beyond end of device loop4: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop4, logical block 10, lost async page write ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x42c9/0x5e70 Read of size 8 at addr ffff88800ed866d8 by task syz-executor/9061 CPU: 0 PID: 9061 Comm: syz-executor Not tainted 5.19.0-rc7-next-20220722 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 Call Trace: dump_stack_lvl+0x8b/0xb3 print_report.cold+0x5e/0x5e5 kasan_report+0xb1/0x1c0 __lock_acquire+0x42c9/0x5e70 lock_acquire+0x1a2/0x530 _raw_spin_lock_irq+0x32/0x50 kmemleak_scan+0x21d/0x16f0 kmemleak_write+0x570/0x680 full_proxy_write+0x11d/0x190 vfs_write+0x2cb/0xd90 ksys_write+0x127/0x250 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f0654d8e5c3 Code: 16 00 00 00 eb ae 90 b8 6e 00 00 00 eb a6 e8 44 ef 04 00 0f 1f 40 00 64 8b 04 25 18 00 00 00 85 c0 75 14 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 55 c3 0f 1f 40 00 48 83 ec 28 48 89 54 24 18 RSP: 002b:00007ffe1a18b9e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffe1a18c028 RCX: 00007f0654d8e5c3 RDX: 0000000000000004 RSI: 00007f0654e44ed9 RDI: 0000000000000003 RBP: 0000000000000002 R08: 00000000000007fa R09: 00007ffe1a1c1080 R10: 00007ffe1a1c1090 R11: 0000000000000246 R12: 00000000fffffff6 R13: 00007ffe1a18cef1 R14: 0000000000000000 R15: 00000000001f2c23 Allocated by task 9039: kasan_save_stack+0x1e/0x40 __kasan_slab_alloc+0x66/0x80 kmem_cache_alloc+0x1b1/0x4a0 __create_object.isra.0+0x3d/0xc10 kmem_cache_alloc+0x24b/0x4a0 __alloc_file+0x21/0x240 alloc_empty_file+0x6d/0x170 path_openat+0xd4/0x2800 do_filp_open+0x1b6/0x410 do_sys_openat2+0x171/0x4c0 __x64_sys_openat+0x13f/0x1f0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd Freed by task 19: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_set_free_info+0x20/0x40 __kasan_slab_free+0x108/0x190 kmem_cache_free+0xfb/0x610 rcu_core+0x7e2/0x2080 __do_softirq+0x1c8/0x8d0 Last potentially related work creation: kasan_save_stack+0x1e/0x40 __kasan_record_aux_stack+0x97/0xb0 call_rcu+0x6a/0xa30 kmem_cache_free+0xc1/0x610 rcu_core+0x7e2/0x2080 __do_softirq+0x1c8/0x8d0 Second to last potentially related work creation: kasan_save_stack+0x1e/0x40 __kasan_record_aux_stack+0x97/0xb0 call_rcu+0x6a/0xa30 kfree+0xbb/0x5e0 skb_release_data+0x6d8/0x810 consume_skb+0xc2/0x160 mac80211_hwsim_tx_frame+0x1f6/0x2a0 mac80211_hwsim_beacon_tx+0x562/0xaa0 __iterate_interfaces+0x2d3/0x560 ieee80211_iterate_active_interfaces_atomic+0x70/0x180 mac80211_hwsim_beacon+0x101/0x200 __hrtimer_run_queues+0x5de/0xbd0 hrtimer_run_softirq+0x172/0x340 __do_softirq+0x1c8/0x8d0 The buggy address belongs to the object at ffff88800ed866c0 which belongs to the cache kmemleak_object of size 368 The buggy address is located 24 bytes inside of 368-byte region [ffff88800ed866c0, ffff88800ed86830) The buggy address belongs to the physical page: page:000000009a6e1dfa refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xed86 head:000000009a6e1dfa order:1 compound_mapcount:0 compound_pincount:0 flags: 0x100000000010200(slab|head|node=0|zone=1) raw: 0100000000010200 0000000000000000 dead000000000001 ffff888007c4f780 raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88800ed86580: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88800ed86600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88800ed86680: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb ^ ffff88800ed86700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88800ed86780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================