================================================================== BUG: KASAN: slab-out-of-bounds in copy_to_urb+0x255/0x440 sound/usb/pcm.c:1437 Write of size 264 at addr ffff88802f128300 by task syz.1.539/8461 CPU: 0 PID: 8461 Comm: syz.1.539 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:364 [inline] print_report+0xa8/0x210 mm/kasan/report.c:468 kasan_report+0x117/0x150 mm/kasan/report.c:581 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x241/0x290 mm/kasan/generic.c:187 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106 copy_to_urb+0x255/0x440 sound/usb/pcm.c:1437 prepare_playback_urb+0x932/0x1380 sound/usb/pcm.c:1565 prepare_outbound_urb+0x372/0xc60 sound/usb/endpoint.c:336 snd_usb_endpoint_start+0x4f1/0x1450 sound/usb/endpoint.c:1623 start_endpoints+0xa1/0x270 sound/usb/pcm.c:273 snd_usb_substream_playback_trigger+0x3e0/0x790 sound/usb/pcm.c:1669 snd_pcm_do_start+0xb1/0x170 sound/core/pcm_native.c:1448 snd_pcm_action_single sound/core/pcm_native.c:1298 [inline] snd_pcm_action+0xda/0x230 sound/core/pcm_native.c:1381 __snd_pcm_lib_xfer+0x16f7/0x1c50 sound/core/pcm_lib.c:2341 snd_pcm_oss_write3+0x1bc/0x320 sound/core/oss/pcm_oss.c:1254 snd_pcm_plug_write_transfer+0x2be/0x4b0 sound/core/oss/pcm_plugin.c:630 snd_pcm_oss_write2+0x1a9/0x410 sound/core/oss/pcm_oss.c:1386 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1452 [inline] snd_pcm_oss_write+0x6ae/0xaf0 sound/core/oss/pcm_oss.c:2812 vfs_write+0x296/0x990 fs/read_write.c:582 ksys_write+0x150/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fb49499aeb9 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:00007fb495847028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fb494c15fa0 RCX: 00007fb49499aeb9 RDX: 00000000000005ce RSI: 0000200000000640 RDI: 0000000000000004 RBP: 00007fb494a08c1f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fb494c16038 R14: 00007fb494c15fa0 R15: 00007ffd636bd6d8 Allocated by task 8461: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4e/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:384 kasan_kmalloc include/linux/kasan.h:198 [inline] __do_kmalloc_node mm/slab_common.c:1007 [inline] __kmalloc+0xb4/0x230 mm/slab_common.c:1020 data_ep_set_params sound/usb/endpoint.c:1263 [inline] snd_usb_endpoint_set_params+0x163e/0x2b40 sound/usb/endpoint.c:1400 snd_usb_hw_params+0x123d/0x19d0 sound/usb/pcm.c:569 snd_pcm_hw_params+0x8a6/0x1ce0 sound/core/pcm_native.c:784 snd_pcm_oss_change_params_locked+0x2042/0x3cf0 sound/core/oss/pcm_oss.c:976 snd_pcm_oss_make_ready_locked sound/core/oss/pcm_oss.c:1199 [inline] snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1417 [inline] snd_pcm_oss_write+0x27e/0xaf0 sound/core/oss/pcm_oss.c:2812 vfs_write+0x296/0x990 fs/read_write.c:582 ksys_write+0x150/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff88802f128300 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes inside of allocated 144-byte region [ffff88802f128300, ffff88802f128390) The buggy address belongs to the physical page: page:ffffea0000bc4a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f128 flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff) page_type: 0xffffffff() raw: 00fff00000000800 ffff888017c41a00 dead000000000122 0000000000000000 raw: 0000000000000000 0000000080100010 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 0x112c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY|__GFP_HARDWALL), pid 5840, tgid 5840 (kworker/0:4), ts 359871256146, free_ts 348398436503 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x1c1/0x200 mm/page_alloc.c:1581 prep_new_page mm/page_alloc.c:1588 [inline] get_page_from_freelist+0x1951/0x19e0 mm/page_alloc.c:3220 __alloc_pages+0x1f0/0x460 mm/page_alloc.c:4486 alloc_slab_page+0x5d/0x160 mm/slub.c:1881 allocate_slab mm/slub.c:2028 [inline] new_slab+0x87/0x2d0 mm/slub.c:2081 ___slab_alloc+0xc5d/0x12f0 mm/slub.c:3253 __slab_alloc mm/slub.c:3339 [inline] __slab_alloc_node mm/slub.c:3392 [inline] slab_alloc_node mm/slub.c:3485 [inline] __kmem_cache_alloc_node+0x19e/0x250 mm/slub.c:3534 __do_kmalloc_node mm/slab_common.c:1006 [inline] __kmalloc+0xa4/0x230 mm/slab_common.c:1020 kmalloc include/linux/slab.h:604 [inline] usb_alloc_urb+0x46/0x140 drivers/usb/core/urb.c:75 usb_internal_control_msg drivers/usb/core/message.c:96 [inline] usb_control_msg+0x119/0x3e0 drivers/usb/core/message.c:154 usb_control_msg_send drivers/usb/core/message.c:214 [inline] usb_set_configuration+0x1271/0x20c0 drivers/usb/core/message.c:2148 usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:238 usb_probe_device+0x13d/0x270 drivers/usb/core/driver.c:293 call_driver_probe drivers/base/dd.c:-1 [inline] really_probe+0x25b/0xb20 drivers/base/dd.c:658 __driver_probe_device+0x18c/0x330 drivers/base/dd.c:800 driver_probe_device+0x4f/0x420 drivers/base/dd.c:830 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1181 [inline] free_unref_page_prepare+0x7b2/0x8c0 mm/page_alloc.c:2365 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2458 discard_slab mm/slub.c:2127 [inline] __unfreeze_partials+0x1cf/0x210 mm/slub.c:2667 put_cpu_partial+0x17c/0x250 mm/slub.c:2743 __slab_free+0x319/0x400 mm/slub.c:3700 qlink_free mm/kasan/quarantine.c:166 [inline] qlist_free_all+0x75/0xd0 mm/kasan/quarantine.c:185 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:306 kasan_slab_alloc include/linux/kasan.h:188 [inline] slab_post_alloc_hook+0x6e/0x4b0 mm/slab.h:767 slab_alloc_node mm/slub.c:3495 [inline] slab_alloc mm/slub.c:3503 [inline] __kmem_cache_alloc_lru mm/slub.c:3510 [inline] kmem_cache_alloc+0x11a/0x2d0 mm/slub.c:3519 getname_flags+0xbb/0x500 fs/namei.c:140 user_path_at_empty+0x2c/0x60 fs/namei.c:2916 user_path_at include/linux/namei.h:57 [inline] ksys_umount fs/namespace.c:1921 [inline] __do_sys_umount fs/namespace.c:1929 [inline] __se_sys_umount fs/namespace.c:1927 [inline] __x64_sys_umount+0xfd/0x180 fs/namespace.c:1927 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Memory state around the buggy address: ffff88802f128280: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88802f128300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88802f128380: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff88802f128400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88802f128480: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================