================================================================== BUG: KASAN: slab-use-after-free in handle_tx+0x1b8/0x604 drivers/net/caif/caif_serial.c:236 Read of size 8 at addr ffff0000c8efe020 by task aoe_tx0/2249 CPU: 0 PID: 2249 Comm: aoe_tx0 Tainted: G B 6.8.0-rc4-syzkaller-g905b00721763 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 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+0x178/0x518 mm/kasan/report.c:488 kasan_report+0xd8/0x138 mm/kasan/report.c:601 __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381 handle_tx+0x1b8/0x604 drivers/net/caif/caif_serial.c:236 caif_xmit+0x108/0x150 drivers/net/caif/caif_serial.c:282 __netdev_start_xmit include/linux/netdevice.h:4989 [inline] netdev_start_xmit include/linux/netdevice.h:5003 [inline] xmit_one net/core/dev.c:3547 [inline] dev_hard_start_xmit+0x240/0x8ac net/core/dev.c:3563 __dev_queue_xmit+0x15b0/0x329c net/core/dev.c:4351 dev_queue_xmit include/linux/netdevice.h:3171 [inline] tx+0x90/0x138 drivers/block/aoe/aoenet.c:62 kthread+0x1ac/0x374 drivers/block/aoe/aoecmd.c:1229 kthread+0x288/0x310 kernel/kthread.c:388 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:860 Allocated by task 7245: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_alloc_info+0x70/0x84 mm/kasan/generic.c:626 poison_kmalloc_redzone mm/kasan/common.c:372 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:389 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x26c/0x49c mm/slub.c:4012 kmalloc include/linux/slab.h:590 [inline] kzalloc include/linux/slab.h:711 [inline] alloc_tty_struct+0xb8/0x684 drivers/tty/tty_io.c:3116 tty_init_dev+0x60/0x3ec drivers/tty/tty_io.c:1415 tty_open_by_driver drivers/tty/tty_io.c:2088 [inline] tty_open+0x804/0xc20 drivers/tty/tty_io.c:2135 chrdev_open+0x3c8/0x4dc fs/char_dev.c:414 do_dentry_open+0x778/0x12b4 fs/open.c:953 vfs_open+0x7c/0x90 fs/open.c:1087 do_open fs/namei.c:3641 [inline] path_openat+0x1f6c/0x2830 fs/namei.c:3798 do_filp_open+0x1bc/0x3cc fs/namei.c:3825 do_sys_openat2+0x124/0x1b8 fs/open.c:1404 do_sys_open fs/open.c:1419 [inline] __do_sys_openat fs/open.c:1435 [inline] __se_sys_openat fs/open.c:1430 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1430 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:51 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:136 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:155 el0_svc+0x54/0x158 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 Freed by task 5530: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x40/0x78 mm/kasan/common.c:68 kasan_save_free_info+0x5c/0x74 mm/kasan/generic.c:640 poison_slab_object+0x124/0x18c mm/kasan/common.c:241 __kasan_slab_free+0x3c/0x78 mm/kasan/common.c:257 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2121 [inline] slab_free mm/slub.c:4299 [inline] kfree+0x144/0x3cc mm/slub.c:4409 free_tty_struct drivers/tty/tty_io.c:174 [inline] release_one_tty+0x22c/0x24c drivers/tty/tty_io.c:1548 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+0xc4/0x110 mm/kasan/generic.c:586 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:612 insert_work+0x54/0x2d4 kernel/workqueue.c:1653 __queue_work+0xcb0/0x12bc 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] queue_release_one_tty drivers/tty/tty_io.c:1559 [inline] kref_put include/linux/kref.h:65 [inline] tty_kref_put+0x14c/0x1c0 drivers/tty/tty_io.c:1572 release_tty+0x3f0/0x4ac drivers/tty/tty_io.c:1608 tty_release_struct+0xb4/0xd4 drivers/tty/tty_io.c:1707 tty_release+0xb64/0x1014 drivers/tty/tty_io.c:1867 __fput+0x30c/0x738 fs/file_table.c:376 ____fput+0x20/0x30 fs/file_table.c:404 task_work_run+0x230/0x2e0 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0x618/0x1f64 kernel/exit.c:871 do_group_exit+0x194/0x22c kernel/exit.c:1020 get_signal+0x1500/0x15ec kernel/signal.c:2893 do_signal arch/arm64/kernel/signal.c:1249 [inline] do_notify_resume+0x3bc/0x393c arch/arm64/kernel/signal.c:1302 exit_to_user_mode_prepare arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:144 [inline] el0_svc+0x9c/0x158 arch/arm64/kernel/entry-common.c:679 el0t_64_sync_handler+0x84/0xfc arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598 The buggy address belongs to the object at ffff0000c8efe000 which belongs to the cache kmalloc-cg-2k of size 2048 The buggy address is located 32 bytes inside of freed 2048-byte region [ffff0000c8efe000, ffff0000c8efe800) The buggy address belongs to the physical page: page:000000005f38e27b refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x108ef8 head:000000005f38e27b order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 memcg:ffff0000c709d6c1 flags: 0x5ffc00000000840(slab|head|node=0|zone=2|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 05ffc00000000840 ffff0000c000f3c0 fffffdffc4a78400 dead000000000002 raw: 0000000000000000 0000000000080008 00000001ffffffff ffff0000c709d6c1 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c8efdf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c8efdf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000c8efe000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c8efe080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c8efe100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================