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BUG: KASAN: slab-out-of-bounds in copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487
Write of size 264 at addr ffff88805c295100 by task syz.2.2804/17205

CPU: 1 UID: 0 PID: 17205 Comm: syz.2.2804 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x2b0/0x2c0 mm/kasan/generic.c:200
 __asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
 copy_to_urb+0x261/0x460 sound/usb/pcm.c:1487
 prepare_playback_urb+0x953/0x13d0 sound/usb/pcm.c:1611
 prepare_outbound_urb+0x377/0xc50 sound/usb/endpoint.c:333
 snd_usb_endpoint_start+0x4d8/0x14a0 sound/usb/endpoint.c:1591
 start_endpoints+0xa1/0x280 sound/usb/pcm.c:291
 snd_usb_substream_playback_trigger+0x3e0/0x7a0 sound/usb/pcm.c:1711
 snd_pcm_do_start+0xb7/0x180 sound/core/pcm_native.c:1454
 snd_pcm_action_single sound/core/pcm_native.c:1310 [inline]
 snd_pcm_action+0xe7/0x240 sound/core/pcm_native.c:1393
 __snd_pcm_lib_xfer+0x1762/0x1ce0 sound/core/pcm_lib.c:2405
 snd_pcm_oss_write3+0x1bc/0x320 sound/core/oss/pcm_oss.c:1241
 snd_pcm_plug_write_transfer+0x2cb/0x4c0 sound/core/oss/pcm_plugin.c:630
 snd_pcm_oss_write2 sound/core/oss/pcm_oss.c:1373 [inline]
 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1439 [inline]
 snd_pcm_oss_write+0xb9c/0x1190 sound/core/oss/pcm_oss.c:2794
 vfs_write+0x27e/0xb30 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb65fd8efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb660c97038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007fb65ffe5fa0 RCX: 00007fb65fd8efc9
RDX: 00000000000005ce RSI: 0000200000000640 RDI: 0000000000000006
RBP: 00007fb65fe11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb65ffe6038 R14: 00007fb65ffe5fa0 R15: 00007fb66010fa28
 </TASK>

Allocated by task 17205:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __do_kmalloc_node mm/slub.c:5642 [inline]
 __kmalloc_noprof+0x411/0x7f0 mm/slub.c:5654
 data_ep_set_params sound/usb/endpoint.c:1242 [inline]
 snd_usb_endpoint_set_params+0x1610/0x29a0 sound/usb/endpoint.c:1374
 snd_usb_hw_params+0xb12/0x1280 sound/usb/pcm.c:576
 snd_pcm_hw_params+0x89d/0x1d30 sound/core/pcm_native.c:804
 snd_pcm_oss_change_params_locked+0x21cb/0x3e40 sound/core/oss/pcm_oss.c:965
 snd_pcm_oss_make_ready_locked sound/core/oss/pcm_oss.c:1186 [inline]
 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1404 [inline]
 snd_pcm_oss_write+0x2fb/0x1190 sound/core/oss/pcm_oss.c:2794
 vfs_write+0x27e/0xb30 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff88805c295100
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 0 bytes inside of
 allocated 120-byte region [ffff88805c295100, ffff88805c295178)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5c295
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801a026a00 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 17205, tgid 17204 (syz.2.2804), ts 861703540643, free_ts 861703519105
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:3055 [inline]
 allocate_slab+0x96/0x350 mm/slub.c:3228
 new_slab mm/slub.c:3282 [inline]
 ___slab_alloc+0xe94/0x18a0 mm/slub.c:4651
 __slab_alloc+0x65/0x100 mm/slub.c:4770
 __slab_alloc_node mm/slub.c:4846 [inline]
 slab_alloc_node mm/slub.c:5268 [inline]
 __do_kmalloc_node mm/slub.c:5641 [inline]
 __kmalloc_node_noprof+0x5cc/0x800 mm/slub.c:5648
 kmalloc_node_noprof include/linux/slab.h:987 [inline]
 __vmalloc_area_node mm/vmalloc.c:3702 [inline]
 __vmalloc_node_range_noprof+0x5bb/0x12d0 mm/vmalloc.c:3897
 __vmalloc_node_noprof mm/vmalloc.c:3960 [inline]
 vmalloc_noprof+0xb2/0xf0 mm/vmalloc.c:3993
 __snd_dma_alloc_pages sound/core/memalloc.c:45 [inline]
 snd_dma_alloc_dir_pages+0x120/0x220 sound/core/memalloc.c:79
 do_alloc_pages+0x175/0x2c0 sound/core/pcm_memory.c:69
 snd_pcm_lib_malloc_pages+0x303/0x690 sound/core/pcm_memory.c:455
 snd_pcm_hw_params+0x7e5/0x1d30 sound/core/pcm_native.c:796
 snd_pcm_oss_change_params_locked+0x21cb/0x3e40 sound/core/oss/pcm_oss.c:965
 snd_pcm_oss_make_ready_locked sound/core/oss/pcm_oss.c:1186 [inline]
 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1404 [inline]
 snd_pcm_oss_write+0x2fb/0x1190 sound/core/oss/pcm_oss.c:2794
page last free pid 17205 tgid 17204 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1394 [inline]
 __free_frozen_pages+0xbc4/0xd30 mm/page_alloc.c:2906
 __kasan_populate_vmalloc mm/kasan/shadow.c:401 [inline]
 kasan_populate_vmalloc+0x256/0x270 mm/kasan/shadow.c:435
 alloc_vmap_area+0xd7a/0x14c0 mm/vmalloc.c:2098
 __get_vm_area_node+0x1f8/0x300 mm/vmalloc.c:3193
 __vmalloc_node_range_noprof+0x30c/0x12d0 mm/vmalloc.c:3857
 __vmalloc_node_noprof mm/vmalloc.c:3960 [inline]
 vmalloc_noprof+0xb2/0xf0 mm/vmalloc.c:3993
 __snd_dma_alloc_pages sound/core/memalloc.c:45 [inline]
 snd_dma_alloc_dir_pages+0x120/0x220 sound/core/memalloc.c:79
 do_alloc_pages+0x175/0x2c0 sound/core/pcm_memory.c:69
 snd_pcm_lib_malloc_pages+0x303/0x690 sound/core/pcm_memory.c:455
 snd_pcm_hw_params+0x7e5/0x1d30 sound/core/pcm_native.c:796
 snd_pcm_oss_change_params_locked+0x21cb/0x3e40 sound/core/oss/pcm_oss.c:965
 snd_pcm_oss_make_ready_locked sound/core/oss/pcm_oss.c:1186 [inline]
 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1404 [inline]
 snd_pcm_oss_write+0x2fb/0x1190 sound/core/oss/pcm_oss.c:2794
 vfs_write+0x27e/0xb30 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:738
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Memory state around the buggy address:
 ffff88805c295000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88805c295080: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805c295100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
                                                                ^
 ffff88805c295180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805c295200: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
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