KASAN: use-after-free Read in tty_write

Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-5.15	KASAN: use-after-free Read in tty_write_room (2)				1	290d	290d	0/3	auto-obsoleted due to no activity on 2024/12/27 00:19
linux-5.15	KASAN: use-after-free Read in tty_write_room (3)				1	145d	145d	0/3	auto-obsoleted due to no activity on 2025/05/21 00:47
upstream	KASAN: use-after-free Read in tty_write_room serial				12	1035d	1293d	0/29	auto-obsoleted due to no activity on 2023/01/01 23:03
linux-6.1	KASAN: use-after-free Read in tty_write_room				4	82d	213d	0/3	upstream: reported on 2024/12/03 11:12
linux-5.15	KASAN: use-after-free Read in tty_write_room				1	624d	624d	0/3	auto-obsoleted due to no activity on 2024/01/27 09:51
upstream	BUG: unable to handle kernel NULL pointer dereference in tty_write_room serial	syz	error		6	738d	795d	0/29	auto-obsoleted due to no activity on 2023/10/05 13:52
upstream	KASAN: slab-use-after-free Read in tty_write_room (2) serial	syz	error	error	185	1d21h	535d	0/29	upstream: reported syz repro on 2024/01/16 15:06
upstream	KASAN: slab-use-after-free Read in tty_write_room serial				1	636d	632d	0/29	auto-obsoleted due to no activity on 2024/01/09 18:18

ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 ================================================================== BUG: KASAN: use-after-free in tty_write_room+0x3c/0x8c drivers/tty/tty_ioctl.c:78 Read of size 8 at addr ffff0000c1680018 by task aoe_tx0/2056 CPU: 0 PID: 2056 Comm: aoe_tx0 Not tainted 5.15.186-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call trace: dump_backtrace+0x0/0x43c arch/arm64/kernel/stacktrace.c:152 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:216 __dump_stack+0x30/0x40 lib/dump_stack.c:88 dump_stack_lvl+0xf8/0x160 lib/dump_stack.c:106 print_address_description+0x78/0x30c mm/kasan/report.c:248 __kasan_report mm/kasan/report.c:434 [inline] kasan_report+0xec/0x15c mm/kasan/report.c:451 __asan_report_load8_noabort+0x44/0x50 mm/kasan/report_generic.c:309 tty_write_room+0x3c/0x8c drivers/tty/tty_ioctl.c:78 handle_tx+0x12c/0x644 drivers/net/caif/caif_serial.c:226 caif_xmit+0x10c/0x160 drivers/net/caif/caif_serial.c:282 __netdev_start_xmit include/linux/netdevice.h:5027 [inline] netdev_start_xmit include/linux/netdevice.h:5041 [inline] xmit_one net/core/dev.c:3649 [inline] dev_hard_start_xmit+0x2a8/0x87c net/core/dev.c:3665 __dev_queue_xmit+0x12d8/0x2800 net/core/dev.c:4288 dev_queue_xmit+0x24/0x34 net/core/dev.c:4321 tx+0x94/0x1cc drivers/block/aoe/aoenet.c:63 kthread+0x160/0x330 drivers/block/aoe/aoecmd.c:1238 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855 Allocated by task 4515: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] __kasan_kmalloc+0xb0/0xf0 mm/kasan/common.c:522 kasan_kmalloc include/linux/kasan.h:264 [inline] kmem_cache_alloc_trace+0x274/0x3fc mm/slub.c:3247 kmalloc include/linux/slab.h:604 [inline] kzalloc include/linux/slab.h:735 [inline] alloc_tty_struct+0xb4/0x684 drivers/tty/tty_io.c:3127 tty_init_dev+0x60/0x41c drivers/tty/tty_io.c:1424 tty_open_by_driver drivers/tty/tty_io.c:2100 [inline] tty_open+0x6f4/0xba8 drivers/tty/tty_io.c:2148 chrdev_open+0x26c/0x4f0 fs/char_dev.c:414 do_dentry_open+0x760/0xebc fs/open.c:826 vfs_open+0x7c/0x90 fs/open.c:956 do_open fs/namei.c:3608 [inline] path_openat+0x1f80/0x26e4 fs/namei.c:3742 do_filp_open+0x164/0x330 fs/namei.c:3769 do_sys_openat2+0x128/0x3d8 fs/open.c:1253 do_sys_open fs/open.c:1269 [inline] __do_sys_openat fs/open.c:1285 [inline] __se_sys_openat fs/open.c:1280 [inline] __arm64_sys_openat+0x120/0x154 fs/open.c:1280 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:52 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x58/0x14c arch/arm64/kernel/syscall.c:181 el0_svc+0x78/0x1e0 arch/arm64/kernel/entry-common.c:608 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 Freed by task 4095: kasan_save_stack mm/kasan/common.c:38 [inline] kasan_set_track+0x4c/0x84 mm/kasan/common.c:46 kasan_set_free_info+0x28/0x4c mm/kasan/generic.c:360 ____kasan_slab_free+0x118/0x164 mm/kasan/common.c:366 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:230 [inline] slab_free_hook mm/slub.c:1705 [inline] slab_free_freelist_hook+0x128/0x1e8 mm/slub.c:1731 slab_free mm/slub.c:3499 [inline] kfree+0x170/0x40c mm/slub.c:4559 free_tty_struct drivers/tty/tty_io.c:175 [inline] release_one_tty+0x244/0x29c drivers/tty/tty_io.c:1558 process_one_work+0x79c/0x1140 kernel/workqueue.c:2310 worker_thread+0x8f4/0x101c kernel/workqueue.c:2457 kthread+0x374/0x454 kernel/kthread.c:334 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:855 Last potentially related work creation: kasan_save_stack+0x38/0x68 mm/kasan/common.c:38 kasan_record_aux_stack+0xcc/0x114 mm/kasan/generic.c:348 insert_work+0x64/0x388 kernel/workqueue.c:1366 __queue_work+0xb30/0x1054 kernel/workqueue.c:1532 queue_work_on+0xc4/0x17c kernel/workqueue.c:1559 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:1569 [inline] kref_put include/linux/kref.h:65 [inline] tty_kref_put+0x150/0x1d0 drivers/tty/tty_io.c:1583 release_tty+0x3e8/0x4a4 drivers/tty/tty_io.c:1620 tty_release_struct+0xb4/0xd4 drivers/tty/tty_io.c:1719 tty_release+0xa9c/0x132c drivers/tty/tty_io.c:1880 __fput+0x1c0/0x7f8 fs/file_table.c:311 ____fput+0x20/0x30 fs/file_table.c:339 task_work_run+0x12c/0x1e0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x684/0x1f58 kernel/exit.c:883 do_group_exit+0x100/0x268 kernel/exit.c:997 get_signal+0x73c/0x1340 kernel/signal.c:2900 do_signal arch/arm64/kernel/signal.c:893 [inline] do_notify_resume+0x35c/0x3128 arch/arm64/kernel/signal.c:946 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:133 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:138 [inline] el0_svc+0xf0/0x1e0 arch/arm64/kernel/entry-common.c:609 el0t_64_sync_handler+0xcc/0xe4 arch/arm64/kernel/entry-common.c:626 el0t_64_sync+0x1a0/0x1a4 arch/arm64/kernel/entry.S:584 The buggy address belongs to the object at ffff0000c1680000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 24 bytes inside of 2048-byte region [ffff0000c1680000, ffff0000c1680800) The buggy address belongs to the page: page:00000000001c36ac refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000c1687000 pfn:0x101680 head:00000000001c36ac order:3 compound_mapcount:0 compound_pincount:0 flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff) raw: 05ffc00000010200 fffffc000368e608 fffffc0003581c08 ffff0000c0002900 raw: ffff0000c1687000 0000000000080004 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff0000c167ff00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff0000c167ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff0000c1680000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff0000c1680080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff0000c1680100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ==================================================================

Crashes (1):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Assets (help?)	Manager	Title
2025/07/04 04:13	linux-5.15.y	3dea0e7f549e	76ad128c	.config	console log	report			info	[disk image] [vmlinux] [kernel image]	ci2-linux-5-15-kasan-arm64	KASAN: use-after-free Read in tty_write_room

Crashes (1):

Assets (help?)