================================================================== BUG: KASAN: vmalloc-out-of-bounds in tpg_fill_plane_buffer+0x1220/0x22b0 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2707 Write of size 128 at addr ffffc90004e94fa0 by task vivid-000-vid-c/13140 CPU: 1 UI CPU: 1 UID: 0 PID: 13140 Comm: vivid-000-vid-c Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 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 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 tpg_fill_plane_buffer+0x1220/0x22b0 drivers/media/common/v4l2-tpg/v4l2-tpg-core.c:2707 vivid_fillbuff drivers/media/test-drivers/vivid/vivid-kthread-cap.c:470 [inline] vivid_thread_vid_cap_tick+0x115c/0x6340 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:629 vivid_thread_vid_cap+0x927/0x11e0 drivers/media/test-drivers/vivid/vivid-kthread-cap.c:767 kthread+0x38b/0x480 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 a 4-page vmalloc region starting at 0xffffc90004e91000 allocated at vb2_vmalloc_alloc+0xef/0x360 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47 The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x1b9 pfn:0x532eb flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000000 0000000000000000 dead000000000122 0000000000000000 raw: 00000000000001b9 0000000000000000 00000001ffffffff 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 0x29c2(GFP_NOWAIT|__GFP_HIGHMEM|__GFP_IO|__GFP_FS|__GFP_ZERO), pid 13138, tgid 13136 (syz.0.1898), ts 835951695698 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436 alloc_pages_mpol+0x21e/0x390 mm/mempolicy.c:2486 alloc_frozen_pages_noprof mm/mempolicy.c:2557 [inline] alloc_pages_noprof+0xb1/0x2b0 mm/mempolicy.c:2577 vm_area_alloc_pages mm/vmalloc.c:3689 [inline] __vmalloc_area_node mm/vmalloc.c:3914 [inline] __vmalloc_node_range_noprof+0x6e5/0x1540 mm/vmalloc.c:4104 vmalloc_user_noprof+0xad/0xe0 mm/vmalloc.c:4259 vb2_vmalloc_alloc+0xef/0x360 drivers/media/common/videobuf2/videobuf2-vmalloc.c:47 __vb2_buf_mem_alloc drivers/media/common/videobuf2/videobuf2-core.c:242 [inline] __vb2_queue_alloc+0xa0b/0x1660 drivers/media/common/videobuf2/videobuf2-core.c:523 vb2_core_reqbufs+0xc3f/0x1470 drivers/media/common/videobuf2/videobuf2-core.c:958 __vb2_init_fileio+0x310/0x1040 drivers/media/common/videobuf2/videobuf2-core.c:2879 vb2_core_poll+0x4b0/0x830 drivers/media/common/videobuf2/videobuf2-core.c:2713 vb2_poll drivers/media/common/videobuf2/videobuf2-v4l2.c:966 [inline] vb2_fop_poll+0x196/0x310 drivers/media/common/videobuf2/videobuf2-v4l2.c:1232 v4l2_poll+0x147/0x2c0 drivers/media/v4l2-core/v4l2-dev.c:350 vfs_poll include/linux/poll.h:82 [inline] do_pollfd fs/select.c:877 [inline] do_poll fs/select.c:920 [inline] do_sys_poll+0x990/0x1110 fs/select.c:1015 __do_sys_ppoll fs/select.c:1112 [inline] __se_sys_ppoll+0x209/0x2b0 fs/select.c:1092 page last free pid 5736 tgid 5736 ts 835660661533 stack trace: reset_page_owner include/linux/page_owner.h:26 [inline] __free_pages_prepare mm/page_alloc.c:1418 [inline] free_pages_prepare+0x9eb/0xaf0 mm/page_alloc.c:1463 __free_contig_range_common+0x174/0x340 mm/page_alloc.c:7072 __free_contig_range mm/page_alloc.c:7117 [inline] free_pages_bulk+0x48/0x120 mm/page_alloc.c:5322 vm_area_free_pages mm/vmalloc.c:3461 [inline] vfree+0x231/0x490 mm/vmalloc.c:3510 dvb_dmxdev_release+0x3c7/0x6a0 drivers/media/dvb-core/dmxdev.c:1476 dvb_usb_adapter_dvb_exit+0x99/0x1b0 drivers/media/usb/dvb-usb/dvb-usb-dvb.c:224 dvb_usb_adapter_exit+0x8d/0x240 drivers/media/usb/dvb-usb/dvb-usb-init.c:128 dvb_usb_exit drivers/media/usb/dvb-usb/dvb-usb-init.c:143 [inline] dvb_usb_device_exit+0x1c3/0x350 drivers/media/usb/dvb-usb/dvb-usb-init.c:338 usb_unbind_interface+0x295/0x9f0 drivers/usb/core/driver.c:461 device_remove drivers/base/dd.c:618 [inline] __device_release_driver drivers/base/dd.c:1349 [inline] device_release_driver_internal+0x4f5/0x880 drivers/base/dd.c:1372 bus_remove_device+0x444/0x560 drivers/base/bus.c:664 device_del+0x524/0x8f0 drivers/base/core.c:3965 usb_disable_device+0x3d4/0x8d0 drivers/usb/core/message.c:1478 usb_disconnect+0x346/0x9a0 drivers/usb/core/hub.c:2350 hub_port_connect drivers/usb/core/hub.c:5420 [inline] hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] port_event drivers/usb/core/hub.c:5884 [inline] hub_event+0x1bbb/0x4d30 drivers/usb/core/hub.c:5966 process_one_work kernel/workqueue.c:3396 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479 Memory state around the buggy address: ffffc90004e94f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffffc90004e94f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffffc90004e95000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffffc90004e95080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffffc90004e95100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ==================================================================