================================================================== BUG: KASAN: use-after-free in handle_tx+0x1ac/0x5f8 drivers/net/caif/caif_serial.c:236 Read of size 8 at addr ffff0000dbc50018 by task aoe_tx0/2059 CPU: 1 PID: 2059 Comm: aoe_tx0 Not tainted 6.1.114-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call trace: dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [inline] print_report+0x174/0x4c0 mm/kasan/report.c:395 kasan_report+0xd4/0x130 mm/kasan/report.c:495 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351 handle_tx+0x1ac/0x5f8 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:4853 [inline] netdev_start_xmit include/linux/netdevice.h:4867 [inline] xmit_one net/core/dev.c:3627 [inline] dev_hard_start_xmit+0x25c/0x9a4 net/core/dev.c:3643 __dev_queue_xmit+0x161c/0x34d0 net/core/dev.c:4297 dev_queue_xmit include/linux/netdevice.h:3021 [inline] tx+0x9c/0x1c8 drivers/block/aoe/aoenet.c:63 kthread+0x1ac/0x374 drivers/block/aoe/aoecmd.c:1237 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Allocated by task 4748: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] kmalloc_trace+0x7c/0x94 mm/slab_common.c:1031 kmalloc include/linux/slab.h:557 [inline] kzalloc include/linux/slab.h:693 [inline] alloc_tty_struct+0xb8/0x68c drivers/tty/tty_io.c:3089 tty_init_dev+0x60/0x3ec drivers/tty/tty_io.c:1408 tty_open_by_driver drivers/tty/tty_io.c:2081 [inline] tty_open+0x804/0xc20 drivers/tty/tty_io.c:2128 chrdev_open+0x3e8/0x4fc fs/char_dev.c:414 do_dentry_open+0x734/0xfa0 fs/open.c:882 vfs_open+0x7c/0x90 fs/open.c:1013 do_open fs/namei.c:3626 [inline] path_openat+0x1e14/0x2548 fs/namei.c:3783 do_filp_open+0x1bc/0x3cc fs/namei.c:3810 do_sys_openat2+0x128/0x3e0 fs/open.c:1318 do_sys_open fs/open.c:1334 [inline] __do_sys_openat fs/open.c:1350 [inline] __se_sys_openat fs/open.c:1345 [inline] __arm64_sys_openat+0x1f0/0x240 fs/open.c:1345 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2c0 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140 do_el0_svc+0x64/0x218 arch/arm64/kernel/syscall.c:204 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 Freed by task 3874: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4c/0x80 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook mm/slub.c:1750 [inline] slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674 kfree+0xcc/0x1b8 mm/slab_common.c:988 free_tty_struct drivers/tty/tty_io.c:173 [inline] release_one_tty+0x224/0x244 drivers/tty/tty_io.c:1541 process_one_work+0x7ac/0x1404 kernel/workqueue.c:2292 worker_thread+0x8e4/0xfec kernel/workqueue.c:2439 kthread+0x250/0x2d8 kernel/kthread.c:376 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864 Last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 insert_work+0x64/0x384 kernel/workqueue.c:1361 __queue_work+0xd48/0x136c kernel/workqueue.c:1520 queue_work_on+0xc0/0x16c kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] schedule_work include/linux/workqueue.h:573 [inline] queue_release_one_tty drivers/tty/tty_io.c:1552 [inline] kref_put include/linux/kref.h:65 [inline] tty_kref_put+0x14c/0x1c0 drivers/tty/tty_io.c:1565 release_tty+0x3f0/0x4ac drivers/tty/tty_io.c:1601 tty_release_struct+0xb4/0xd4 drivers/tty/tty_io.c:1700 tty_release+0xb64/0x1014 drivers/tty/tty_io.c:1860 __fput+0x1c8/0x7c8 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x240/0x2f0 kernel/task_work.c:203 exit_task_work include/linux/task_work.h:39 [inline] do_exit+0x554/0x1a88 kernel/exit.c:871 do_group_exit+0x194/0x22c kernel/exit.c:1021 get_signal+0x14a0/0x158c kernel/signal.c:2870 do_signal arch/arm64/kernel/signal.c:1076 [inline] do_notify_resume+0x3ac/0x3474 arch/arm64/kernel/signal.c:1129 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] asm_exit_to_user_mode+0x70/0x84 arch/arm64/kernel/entry-common.c:149 ret_from_fork+0x1c/0x20 arch/arm64/kernel/entry.S:867 Second to last potentially related work creation: kasan_save_stack+0x40/0x70 mm/kasan/common.c:45 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496 insert_work+0x64/0x384 kernel/workqueue.c:1361 __queue_work+0xd48/0x136c kernel/workqueue.c:1520 queue_work_on+0xc0/0x16c kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] schedule_work include/linux/workqueue.h:573 [inline] queue_release_one_tty drivers/tty/tty_io.c:1552 [inline] kref_put include/linux/kref.h:65 [inline] tty_kref_put+0x14c/0x1c0 drivers/tty/tty_io.c:1565 release_tty+0x3f0/0x4ac drivers/tty/tty_io.c:1601 tty_release_struct+0xb4/0xd4 drivers/tty/tty_io.c:1700 tty_release+0xb64/0x1014 drivers/tty/tty_io.c:1860 __fput+0x1c8/0x7c8 fs/file_table.c:320 ____fput+0x20/0x30 fs/file_table.c:348 task_work_run+0x240/0x2f0 kernel/task_work.c:203 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x2148/0x3474 arch/arm64/kernel/signal.c:1132 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585 The buggy address belongs to the object at ffff0000dbc50000 which belongs to the cache kmalloc-cg-2k of size 2048 The buggy address is located 24 bytes inside of 2048-byte region [ffff0000dbc50000, ffff0000dbc50800) The buggy address belongs to the physical page: page:00000000d181af3e refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11bc50 head:00000000d181af3e order:3 compound_mapcount:0 compound_pincount:0 memcg:ffff0000cb511b01 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 0000000000000000 dead000000000001 ffff0000c0003380 raw: 0000000000000000 0000000000080008 00000001ffffffff ffff0000cb511b01 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000dbc4ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000dbc4ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000dbc50000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000dbc50080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000dbc50100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================