================================================================== BUG: KASAN: slab-use-after-free in __do_sys_io_cancel fs/aio.c:2207 [inline] BUG: KASAN: slab-use-after-free in __se_sys_io_cancel fs/aio.c:2174 [inline] BUG: KASAN: slab-use-after-free in __arm64_sys_io_cancel+0x370/0x374 fs/aio.c:2174 Read of size 4 at addr ffff0000e95672a0 by task syz-executor.0/7334 CPU: 1 PID: 7334 Comm: syz-executor.0 Not tainted 6.8.0-rc7-syzkaller-g707081b61156 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:291 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:377 [inline] print_report+0x198/0x538 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load4_noabort+0x20/0x2c mm/kasan/report_generic.c:380 __do_sys_io_cancel fs/aio.c:2207 [inline] __se_sys_io_cancel fs/aio.c:2174 [inline] __arm64_sys_io_cancel+0x370/0x374 fs/aio.c:2174 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Allocated by task 7334: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x40/0x50 mm/kasan/generic.c:575 unpoison_slab_object mm/kasan/common.c:312 [inline] __kasan_slab_alloc+0x74/0x8c mm/kasan/common.c:338 kasan_slab_alloc include/linux/kasan.h:201 [inline] slab_post_alloc_hook mm/slub.c:3813 [inline] slab_alloc_node mm/slub.c:3860 [inline] kmem_cache_alloc+0x1dc/0x488 mm/slub.c:3867 aio_get_req fs/aio.c:1060 [inline] io_submit_one+0x204/0x14fc fs/aio.c:2050 __do_sys_io_submit fs/aio.c:2113 [inline] __se_sys_io_submit fs/aio.c:2083 [inline] __arm64_sys_io_submit+0x248/0x3c8 fs/aio.c:2083 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 6259: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x54/0x6c mm/kasan/generic.c:589 poison_slab_object+0x124/0x18c mm/kasan/common.c:240 __kasan_slab_free+0x3c/0x70 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kmem_cache_free+0x15c/0x3d4 mm/slub.c:4363 iocb_destroy fs/aio.c:1112 [inline] iocb_put+0x680/0x8c4 fs/aio.c:1212 aio_poll_complete_work+0x3a4/0x570 fs/aio.c:1767 process_one_work+0x694/0x1204 kernel/workqueue.c:2633 process_scheduled_works kernel/workqueue.c:2706 [inline] worker_thread+0x938/0xef4 kernel/workqueue.c:2787 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Last potentially related work creation: kasan_save_stack+0x40/0x6c mm/kasan/common.c:47 __kasan_record_aux_stack+0xd0/0xec mm/kasan/generic.c:551 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:561 insert_work+0x54/0x2d4 kernel/workqueue.c:1653 __queue_work+0xce0/0x12ec kernel/workqueue.c:1802 queue_work_on+0x9c/0x128 kernel/workqueue.c:1837 queue_work include/linux/workqueue.h:548 [inline] schedule_work include/linux/workqueue.h:609 [inline] aio_poll_cancel+0xc4/0x13c fs/aio.c:1779 __do_sys_io_cancel fs/aio.c:2196 [inline] __se_sys_io_cancel fs/aio.c:2174 [inline] __arm64_sys_io_cancel+0x1cc/0x374 fs/aio.c:2174 __invoke_syscall arch/arm64/kernel/syscall.c:34 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:48 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:133 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:152 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:712 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:730 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff0000e9567280 which belongs to the cache aio_kiocb of size 216 The buggy address is located 32 bytes inside of freed 216-byte region [ffff0000e9567280, ffff0000e9567358) The buggy address belongs to the physical page: page:000000006182d35d refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x129567 flags: 0x5ffc00000000800(slab|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000000800 ffff0000c3eb78c0 dead000000000122 0000000000000000 raw: 0000000000000000 00000000800c000c 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000e9567180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff0000e9567200: 00 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000e9567280: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000e9567300: fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc ffff0000e9567380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================