================================================================== BUG: KASAN: use-after-free in list_empty include/linux/list.h:189 [inline] BUG: KASAN: use-after-free in sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2120 Read of size 8 at addr ffff8801cd5b97c0 by task syz-executor2/11811 CPU: 0 PID: 11811 Comm: syz-executor2 Not tainted 4.4.114-ga81d322 #4 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 0000000000000000 e33bb729f73e2565 ffff8800b6f179f0 ffffffff81d0394d ffffea0007356e40 ffff8801cd5b97c0 0000000000000000 ffff8801cd5b97c0 ffff8800a6022338 ffff8800b6f17a28 ffffffff814fe1d3 ffff8801cd5b97c0 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x124 lib/dump_stack.c:51 [] print_address_description+0x73/0x260 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report+0x285/0x370 mm/kasan/report.c:408 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [] list_empty include/linux/list.h:189 [inline] [] sg_remove_request+0xf9/0x110 drivers/scsi/sg.c:2120 [] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1837 [] sg_read+0xa1b/0x1490 drivers/scsi/sg.c:537 [] do_loop_readv_writev+0x141/0x1e0 fs/read_write.c:680 [] do_readv_writev+0x5dd/0x6e0 fs/read_write.c:810 [] vfs_readv+0x78/0xb0 fs/read_write.c:834 [] SYSC_readv fs/read_write.c:860 [inline] [] SyS_readv+0xd9/0x240 fs/read_write.c:852 [] entry_SYSCALL_64_fastpath+0x1c/0x98 Allocated by task 8675: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:616 [] kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:554 [] slab_post_alloc_hook mm/slub.c:1349 [inline] [] slab_alloc_node mm/slub.c:2615 [inline] [] slab_alloc mm/slub.c:2623 [inline] [] kmem_cache_alloc+0xba/0x290 mm/slub.c:2628 [] fasync_alloc fs/fcntl.c:607 [inline] [] fasync_add_entry fs/fcntl.c:665 [inline] [] fasync_helper+0x37/0xb0 fs/fcntl.c:694 [] pipe_fasync+0xb7/0x1c0 fs/pipe.c:583 [] setfl fs/fcntl.c:69 [inline] [] do_fcntl fs/fcntl.c:270 [inline] [] SYSC_fcntl fs/fcntl.c:375 [inline] [] SyS_fcntl+0x64f/0xc40 fs/fcntl.c:360 [] entry_SYSCALL_64_fastpath+0x1c/0x98 Freed by task 4001: [] save_stack_trace+0x26/0x50 arch/x86/kernel/stacktrace.c:63 [] save_stack+0x43/0xd0 mm/kasan/kasan.c:512 [] set_track mm/kasan/kasan.c:524 [inline] [] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:589 [] slab_free_hook mm/slub.c:1383 [inline] [] slab_free_freelist_hook mm/slub.c:1405 [inline] [] slab_free mm/slub.c:2859 [inline] [] kmem_cache_free+0xc7/0x320 mm/slub.c:2881 [] fasync_free_rcu+0x1d/0x20 fs/fcntl.c:566 [] __rcu_reclaim kernel/rcu/rcu.h:118 [inline] [] rcu_do_batch kernel/rcu/tree.c:2705 [inline] [] invoke_rcu_callbacks kernel/rcu/tree.c:2973 [inline] [] __rcu_process_callbacks kernel/rcu/tree.c:2940 [inline] [] rcu_process_callbacks+0x7f4/0x14a0 kernel/rcu/tree.c:2957 [] __do_softirq+0x227/0xa38 kernel/softirq.c:273 The buggy address belongs to the object at ffff8801cd5b9780 which belongs to the cache fasync_cache of size 96 The buggy address is located 64 bytes inside of 96-byte region [ffff8801cd5b9780, ffff8801cd5b97e0) The buggy address belongs to the page: