syz-executor.7: attempt to access beyond end of device loop7: rw=2049, sector=40, nr_sectors = 4 limit=40 Buffer I/O error on dev loop7, logical block 10, lost async page write ================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x42c9/0x5e70 Read of size 8 at addr ffff888045779cc8 by task syz-executor/10917 CPU: 1 PID: 10917 Comm: syz-executor Not tainted 5.19.0-next-20220805 #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: 0033:0x7fc187da05c3 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:00007fff08d59088 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fff08d596c8 RCX: 00007fc187da05c3 RDX: 0000000000000004 RSI: 00007fc187e56ed9 RDI: 0000000000000003 RBP: 0000000000000002 R08: 000000000000096c R09: 00007fff08dd2080 R10: 00007fff08dd2090 R11: 0000000000000246 R12: 00000000fffffff6 R13: 00007fff08d59ef1 R14: 0000000000000000 R15: 000000000024d197 Allocated by task 10922: kasan_save_stack+0x1e/0x40 __kasan_slab_alloc+0x66/0x80 kmem_cache_alloc+0x1b1/0x4a0 __create_object.isra.0+0x3d/0xc10 kmem_cache_alloc_lru+0x2e4/0x7e0 shmem_alloc_inode+0x23/0x50 alloc_inode+0x63/0x240 new_inode+0x21/0x1e0 shmem_get_inode+0x191/0xde0 shmem_symlink+0xe2/0x7f0 vfs_symlink+0x364/0x5b0 do_symlinkat+0x144/0x2a0 __x64_sys_symlink+0x75/0x90 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 i_callback+0x42/0x70 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 kmem_cache_free+0xc1/0x610 kfree_skbmem+0xef/0x1b0 kfree_skb_reason+0x85/0x110 ieee80211_iface_work+0x34f/0xc80 process_one_work+0xa0f/0x1690 worker_thread+0x637/0x1260 kthread+0x2ed/0x3a0 ret_from_fork+0x22/0x30 The buggy address belongs to the object at ffff888045779cb0 which belongs to the cache kmemleak_object of size 368 The buggy address is located 24 bytes inside of 368-byte region [ffff888045779cb0, ffff888045779e20) The buggy address belongs to the physical page: page:00000000edc77887 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x45778 head:00000000edc77887 order:1 compound_mapcount:0 compound_pincount:0 flags: 0x100000000010200(slab|head|node=0|zone=1) raw: 0100000000010200 ffffea00005c3d80 dead000000000004 ffff888007c4f780 raw: 0000000000000000 0000000000120012 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888045779b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888045779c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc >ffff888045779c80: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb ^ ffff888045779d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888045779d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================