================================================================== BUG: KASAN: slab-out-of-bounds in ec168_i2c_xfer+0x4cd/0x640 drivers/media/usb/dvb-usb-v2/ec168.c:143 Read of size 1 at addr ffff888021299c01 by task syz.0.17/6001 CPU: 1 UID: 0 PID: 6001 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: 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 ec168_i2c_xfer+0x4cd/0x640 drivers/media/usb/dvb-usb-v2/ec168.c:143 __i2c_transfer+0x79a/0x1f70 drivers/i2c/i2c-core-base.c:-1 i2c_transfer+0x1cc/0x2d0 drivers/i2c/i2c-core-base.c:2317 i2cdev_ioctl_rdwr+0x460/0x740 drivers/i2c/i2c-dev.c:306 i2cdev_ioctl+0x6a5/0x880 drivers/i2c/i2c-dev.c:467 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f270e79c799 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fffb8093c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f270ea15fa0 RCX: 00007f270e79c799 RDX: 0000200000000140 RSI: 0000000000000707 RDI: 0000000000000004 RBP: 00007f270e832c99 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f270ea15fac R14: 00007f270ea15fa0 R15: 00007f270ea15fa0 Allocated by task 6001: 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:5292 [inline] __kmalloc_node_track_caller_noprof+0x4db/0x7b0 mm/slub.c:5400 memdup_user+0x2b/0xd0 mm/util.c:221 i2cdev_ioctl_rdwr+0x1c6/0x740 drivers/i2c/i2c-dev.c:266 i2cdev_ioctl+0x6a5/0x880 drivers/i2c/i2c-dev.c:467 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f The buggy address belongs to the object at ffff888021299c00 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes to the right of allocated 1-byte region [ffff888021299c00, ffff888021299c01) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880212996a0 pfn:0x21299 flags: 0xfff00000000200(workingset|node=0|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 00fff00000000200 ffff88801b041500 ffffea000083bfd0 ffffea000084ae50 raw: ffff8880212996a0 000000080080007d 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 3214649695, free_ts 3079873000 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x231/0x280 mm/page_alloc.c:1859 prep_new_page mm/page_alloc.c:1867 [inline] get_page_from_freelist+0x2418/0x24b0 mm/page_alloc.c:3926 __alloc_frozen_pages_noprof+0x233/0x3d0 mm/page_alloc.c:5213 alloc_slab_page mm/slub.c:3278 [inline] allocate_slab+0x77/0x660 mm/slub.c:3467 new_slab mm/slub.c:3525 [inline] refill_objects+0x339/0x3d0 mm/slub.c:7247 refill_sheaf mm/slub.c:2816 [inline] __pcs_replace_empty_main+0x321/0x720 mm/slub.c:4651 alloc_from_pcs mm/slub.c:4749 [inline] slab_alloc_node mm/slub.c:4883 [inline] __do_kmalloc_node mm/slub.c:5291 [inline] __kmalloc_noprof+0x474/0x760 mm/slub.c:5304 kmalloc_noprof include/linux/slab.h:954 [inline] kzalloc_noprof include/linux/slab.h:1188 [inline] acpi_ns_internalize_name+0x2c9/0x3e0 drivers/acpi/acpica/nsutils.c:331 acpi_ns_get_node_unlocked+0x186/0x480 drivers/acpi/acpica/nsutils.c:666 acpi_ns_get_node+0x76/0xc0 drivers/acpi/acpica/nsutils.c:726 acpi_get_handle+0x192/0x2a0 drivers/acpi/acpica/nsxfname.c:98 acpi_has_method+0x8c/0xe0 drivers/acpi/utils.c:672 acpi_bus_get_flags drivers/acpi/scan.c:1150 [inline] acpi_init_device_object+0x1726/0x2ae0 drivers/acpi/scan.c:1821 acpi_add_single_object+0x106/0x1c20 drivers/acpi/scan.c:1870 acpi_bus_check_add+0x2b7/0x8a0 drivers/acpi/scan.c:2171 acpi_ns_walk_namespace+0x2a7/0x770 drivers/acpi/acpica/nswalk.c:-1 page last free pid 1 tgid 1 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] __free_pages_prepare mm/page_alloc.c:1403 [inline] __free_frozen_pages+0xbc7/0xd30 mm/page_alloc.c:2944 __slab_free+0x274/0x2c0 mm/slub.c:5605 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179 kasan_quarantine_remove_cache+0x342/0x360 mm/kasan/quarantine.c:378 kmem_cache_shrink+0xd/0x20 mm/slab_common.c:604 acpi_os_purge_cache+0x15/0x20 drivers/acpi/osl.c:1622 acpi_purge_cached_objects+0xac/0x100 drivers/acpi/acpica/utxface.c:239 acpi_initialize_objects+0x2e/0xb0 drivers/acpi/acpica/utxfinit.c:250 acpi_bus_init+0xa8/0x360 drivers/acpi/bus.c:1421 acpi_init+0xa1/0x1f0 drivers/acpi/bus.c:1510 do_one_initcall+0x250/0x870 init/main.c:1386 do_initcall_level+0x104/0x190 init/main.c:1448 do_initcalls+0x59/0xa0 init/main.c:1464 kernel_init_freeable+0x2a6/0x3e0 init/main.c:1696 kernel_init+0x1d/0x1d0 init/main.c:1586 ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158 Memory state around the buggy address: ffff888021299b00: 00 fc fc fc fa fc fc fc 00 fc fc fc fa fc fc fc ffff888021299b80: fa fc fc fc fa fc fc fc fa fc fc fc fa fc fc fc >ffff888021299c00: 01 fc fc fc 00 fc fc fc fa fc fc fc fa fc fc fc ^ ffff888021299c80: 07 fc fc fc 07 fc fc fc fa fc fc fc 05 fc fc fc ffff888021299d00: 06 fc fc fc 06 fc fc fc 06 fc fc fc fa fc fc fc ==================================================================