================================================================== BUG: KASAN: use-after-free in __read_once_size include/linux/compiler.h:243 [inline] BUG: KASAN: use-after-free in list_empty include/linux/list.h:189 [inline] BUG: KASAN: use-after-free in sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2110 Read of size 8 at addr ffff8801c4379ec0 by task syz-executor4/25931 CPU: 0 PID: 25931 Comm: syz-executor4 Not tainted 4.9.86-gb324a70 #50 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801b6ac7a60 ffffffff81d956f9 ffffea000710de40 ffff8801c4379ec0 0000000000000000 ffff8801c4379ec0 ffff8801c4982338 ffff8801b6ac7a98 ffffffff8153e083 ffff8801c4379ec0 0000000000000008 0000000000000000 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] print_address_description+0x73/0x280 mm/kasan/report.c:252 [] kasan_report_error mm/kasan/report.c:351 [inline] [] kasan_report+0x275/0x360 mm/kasan/report.c:408 [] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429 [] __read_once_size include/linux/compiler.h:243 [inline] [] list_empty include/linux/list.h:189 [inline] [] sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2110 [] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1827 [] sg_read+0xa16/0x1440 drivers/scsi/sg.c:526 [] __vfs_read+0x103/0x670 fs/read_write.c:449 [] vfs_read+0x11e/0x380 fs/read_write.c:472 [] SYSC_read fs/read_write.c:588 [inline] [] SyS_read+0xd9/0x1b0 fs/read_write.c:581 [] do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Allocated by task 25950: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_kmalloc+0xad/0xe0 mm/kasan/kasan.c:609 kasan_slab_alloc+0x12/0x20 mm/kasan/kasan.c:547 slab_post_alloc_hook mm/slab.h:417 [inline] slab_alloc_node mm/slub.c:2715 [inline] slab_alloc mm/slub.c:2723 [inline] kmem_cache_alloc+0xba/0x290 mm/slub.c:2728 fasync_alloc+0x1a/0x20 fs/fcntl.c:608 do_fcntl_add_lease fs/locks.c:1888 [inline] fcntl_setlease+0xcb/0x220 fs/locks.c:1917 do_fcntl fs/fcntl.c:329 [inline] SYSC_fcntl fs/fcntl.c:376 [inline] SyS_fcntl+0x6e6/0xc70 fs/fcntl.c:361 do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb Freed by task 25950: save_stack_trace+0x16/0x20 arch/x86/kernel/stacktrace.c:57 save_stack+0x43/0xd0 mm/kasan/kasan.c:505 set_track mm/kasan/kasan.c:517 [inline] kasan_slab_free+0x72/0xc0 mm/kasan/kasan.c:582 slab_free_hook mm/slub.c:1355 [inline] slab_free_freelist_hook mm/slub.c:1377 [inline] slab_free mm/slub.c:2958 [inline] kmem_cache_free+0xc7/0x300 mm/slub.c:2980 fasync_free+0x1c/0x20 fs/fcntl.c:618 do_fcntl_add_lease fs/locks.c:1899 [inline] fcntl_setlease+0x168/0x220 fs/locks.c:1917 do_fcntl fs/fcntl.c:329 [inline] SYSC_fcntl fs/fcntl.c:376 [inline] SyS_fcntl+0x6e6/0xc70 fs/fcntl.c:361 do_syscall_64+0x1a4/0x490 arch/x86/entry/common.c:282 entry_SYSCALL_64_after_swapgs+0x5d/0xdb The buggy address belongs to the object at ffff8801c4379e80 which belongs to the cache fasync_cache of size 96 The buggy address is located 64 bytes inside of 96-byte region [ffff8801c4379e80, ffff8801c4379ee0) The buggy address belongs to the page: page:ffffea000710de40 count:1 mapcount:0 mapping: (null) index:0xffff8801c4379980 flags: 0x8000000000000080(slab) page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8801c4379d80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff8801c4379e00: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc >ffff8801c4379e80: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc ^ ffff8801c4379f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff8801c4379f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================