KASAN: slab-out-of-bounds Read in dw210x_op_rw

Status: upstream: reported C repro on 2026/08/05 22:46
Subsystems: media
[Documentation on labels]
Reported-by: syzbot+f408eac9faa61d5a1927@syzkaller.appspotmail.com
First crash: 2d13h, last: 2d04h
▶ ▼ ✨ AI Jobs (3)
ID Workflow Result Correct Bug Created Started Finished Revision
1984d3dc patching ⏳ KASAN: slab-out-of-bounds Read in dw210x_op_rw 2026/08/06 06:47
1005680b assessment-security ⏳ KASAN: slab-out-of-bounds Read in dw210x_op_rw 2026/08/06 06:47
707087c5 assessment-security 💥 KASAN: slab-out-of-bounds Read in dw210x_op_rw 2026/08/05 00:03 2026/08/05 00:03 2026/08/05 00:03 d4abbeac
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[PATCH] media: dw2102: fix OOB read on firmware size not a multiple of 64 1 (1) 2026/08/06 17:47
[syzbot] [media?] KASAN: slab-out-of-bounds Read in dw210x_op_rw 0 (2) 2026/08/06 10:41
▶ ▼ Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/08/06 10:41 7h35m vasilisalmpanis@gmail.com patch git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 848acc8ffe1b OK log

Sample crash report:
dvb-usb: downloading firmware from file 'dvb-usb-dw3101.fw'
dw2102: start downloading DW210X firmware
==================================================================
BUG: KASAN: slab-out-of-bounds in dw210x_op_rw+0xb6/0x180 drivers/media/usb/dvb-usb/dw2102.c:102
Read of size 64 at addr ffff88802bcf2ba0 by task kworker/1:2/803

CPU: 1 UID: 0 PID: 803 Comm: kworker/1:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
Workqueue: usb_hub_wq hub_event
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_address_description+0x55/0x1e0 mm/kasan/report.c:378
 print_report+0x58/0x70 mm/kasan/report.c:482
 kasan_report+0x117/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 __asan_memcpy+0x29/0x70 mm/kasan/shadow.c:105
 dw210x_op_rw+0xb6/0x180 drivers/media/usb/dvb-usb/dw2102.c:102
 dw2102_load_firmware+0x2b4/0x970 drivers/media/usb/dvb-usb/dw2102.c:1906
 dvb_usb_download_firmware+0x1c3/0x270 drivers/media/usb/dvb-usb/dvb-usb-firmware.c:109
 dvb_usb_device_init+0xddf/0x2570 drivers/media/usb/dvb-usb/dvb-usb-init.c:298
 dw2102_probe+0x8a/0x270 drivers/media/usb/dvb-usb/dw2102.c:2594
 usb_probe_interface+0x653/0xc60 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3772
 usb_set_configuration+0x1ad8/0x2180 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3772
 usb_new_device+0x99d/0x1620 drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5953
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 803:
 kasan_save_stack mm/kasan/common.c:57 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
 poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:415
 kasan_kmalloc include/linux/kasan.h:263 [inline]
 __do_kmalloc_node mm/slub.c:5334 [inline]
 __kmalloc_noprof+0x375/0x720 mm/slub.c:5359
 _kmalloc_noprof include/linux/slab.h:992 [inline]
 dw2102_load_firmware+0x175/0x970 drivers/media/usb/dvb-usb/dw2102.c:1896
 dvb_usb_download_firmware+0x1c3/0x270 drivers/media/usb/dvb-usb/dvb-usb-firmware.c:109
 dvb_usb_device_init+0xddf/0x2570 drivers/media/usb/dvb-usb/dvb-usb-init.c:298
 dw2102_probe+0x8a/0x270 drivers/media/usb/dvb-usb/dw2102.c:2594
 usb_probe_interface+0x653/0xc60 drivers/usb/core/driver.c:396
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3772
 usb_set_configuration+0x1ad8/0x2180 drivers/usb/core/message.c:2268
 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
 usb_probe_device+0x1c3/0x3b0 drivers/usb/core/driver.c:291
 call_driver_probe drivers/base/dd.c:-1 [inline]
 really_probe+0x254/0xae0 drivers/base/dd.c:706
 __driver_probe_device+0x1e8/0x360 drivers/base/dd.c:868
 driver_probe_device+0x4f/0x240 drivers/base/dd.c:898
 __device_attach_driver+0x270/0x410 drivers/base/dd.c:1026
 bus_for_each_drv+0x258/0x2f0 drivers/base/bus.c:500
 __device_attach+0x2c4/0x450 drivers/base/dd.c:1098
 device_initial_probe+0xa1/0xd0 drivers/base/dd.c:1153
 bus_probe_device+0x12a/0x220 drivers/base/bus.c:620
 device_add+0x7d7/0xb80 drivers/base/core.c:3772
 usb_new_device+0x99d/0x1620 drivers/usb/core/hub.c:2695
 hub_port_connect drivers/usb/core/hub.c:5567 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
 port_event drivers/usb/core/hub.c:5871 [inline]
 hub_event+0x28e8/0x4d30 drivers/usb/core/hub.c:5953
 process_one_work kernel/workqueue.c:3322 [inline]
 process_scheduled_works+0xa8e/0x14e0 kernel/workqueue.c:3405
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3486
 kthread+0x388/0x470 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

The buggy address belongs to the object at ffff88802bcf2ba0
 which belongs to the cache kmalloc-16 of size 16
The buggy address is located 0 bytes inside of
 allocated 16-byte region [ffff88802bcf2ba0, ffff88802bcf2bb0)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88802bcf2600 pfn:0x2bcf2
flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000200 ffff88801b001640 ffff88801b000408 ffffea0000af2d50
raw: ffff88802bcf2600 000000080080007a 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 1, tgid 1 (swapper/0), ts 16259999448, free_ts 0
 create_dummy_stack mm/page_owner.c:103 [inline]
 register_dummy_stack+0x98/0x100 mm/page_owner.c:109
 init_page_owner+0x2e/0x5f0 mm/page_owner.c:127
 invoke_init_callbacks mm/page_ext.c:152 [inline]
 page_ext_init+0x509/0x550 mm/page_ext.c:490
 mm_core_init+0x97/0xb0 mm/mm_init.c:2748
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88802bcf2a80: 00 00 fc fc fa fb fc fc 00 01 fc fc 00 01 fc fc
 ffff88802bcf2b00: 00 01 fc fc 00 04 fc fc 00 04 fc fc 00 04 fc fc
>ffff88802bcf2b80: 00 04 fc fc 00 00 fc fc 00 00 fc fc fa fb fc fc
                                     ^
 ffff88802bcf2c00: 00 00 fc fc 00 00 fc fc 00 00 fc fc 00 00 fc fc
 ffff88802bcf2c80: 00 00 fc fc fa fb fc fc fa fb fc fc fa fb fc fc
==================================================================

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/08/04 21:56 upstream 848acc8ffe1b d4abbeac .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 19:01 upstream 848acc8ffe1b d4abbeac .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 18:26 upstream 848acc8ffe1b d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 18:26 upstream 848acc8ffe1b d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-badwrites-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 16:00 upstream 848acc8ffe1b d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 15:36 upstream 848acc8ffe1b d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 13:36 upstream 848acc8ffe1b d4abbeac .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 13:20 upstream 848acc8ffe1b 3c5eaa21 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 13:20 upstream 848acc8ffe1b 3c5eaa21 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 13:17 upstream 848acc8ffe1b 3c5eaa21 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
2026/08/04 13:17 upstream 848acc8ffe1b 3c5eaa21 .config console log report [disk image (non-bootable)] [vmlinux] [kernel image] ci-snapshot-upstream-root KASAN: slab-out-of-bounds Read in dw210x_op_rw
* Struck through repros no longer work on HEAD.