syzbot

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BUG: KASAN: slab-out-of-bounds in copy_to_urb+0x255/0x440 sound/usb/pcm.c:1437
Write of size 264 at addr ffff888072d73b00 by task syz.0.17/5947

CPU: 1 PID: 5947 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:364 [inline]
 print_report+0xac/0x220 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+0x288/0x290 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+0x932/0x1360 sound/usb/pcm.c:1565
 prepare_outbound_urb+0x372/0xc40 sound/usb/endpoint.c:336
 snd_usb_endpoint_start+0x4d9/0x1440 sound/usb/endpoint.c:1618
 start_endpoints+0xa1/0x270 sound/usb/pcm.c:273
 snd_usb_substream_playback_trigger+0x3e0/0x7a0 sound/usb/pcm.c:1669
 snd_pcm_do_start+0xb1/0x170 sound/core/pcm_native.c:1443
 snd_pcm_action_single sound/core/pcm_native.c:1293 [inline]
 snd_pcm_action+0xda/0x230 sound/core/pcm_native.c:1376
 __snd_pcm_lib_xfer+0x16fa/0x1c40 sound/core/pcm_lib.c:2341
 snd_pcm_oss_write3+0x1bc/0x320 sound/core/oss/pcm_oss.c:1252
 snd_pcm_plug_write_transfer+0x2b8/0x4a0 sound/core/oss/pcm_plugin.c:630
 snd_pcm_oss_write2 sound/core/oss/pcm_oss.c:1384 [inline]
 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1450 [inline]
 snd_pcm_oss_write+0xbb5/0x1120 sound/core/oss/pcm_oss.c:2810
 vfs_write+0x288/0x940 fs/read_write.c:582
 ksys_write+0x147/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f8b97d8f749
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:00007ffeb0c35718 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f8b97fe5fa0 RCX: 00007f8b97d8f749
RDX: 00000000000005ce RSI: 0000200000000640 RDI: 0000000000000004
RBP: 00007f8b97e13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8b97fe5fa0 R14: 00007f8b97fe5fa0 R15: 0000000000000003
 </TASK>

Allocated by task 5947:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:198 [inline]
 __do_kmalloc_node mm/slab_common.c:1007 [inline]
 __kmalloc+0xb4/0x240 mm/slab_common.c:1020
 data_ep_set_params sound/usb/endpoint.c:1263 [inline]
 snd_usb_endpoint_set_params+0x1575/0x28e0 sound/usb/endpoint.c:1395
 snd_usb_hw_params+0x123e/0x19c0 sound/usb/pcm.c:569
 snd_pcm_hw_params+0x835/0x1c50 sound/core/pcm_native.c:779
 snd_pcm_oss_change_params_locked+0x2144/0x3d30 sound/core/oss/pcm_oss.c:976
 snd_pcm_oss_make_ready_locked sound/core/oss/pcm_oss.c:1197 [inline]
 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1415 [inline]
 snd_pcm_oss_write+0x2ff/0x1120 sound/core/oss/pcm_oss.c:2810
 vfs_write+0x288/0x940 fs/read_write.c:582
 ksys_write+0x147/0x250 fs/read_write.c:637
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

The buggy address belongs to the object at ffff888072d73b00
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 0 bytes inside of
 allocated 120-byte region [ffff888072d73b00, ffff888072d73b78)

The buggy address belongs to the physical page:
page:ffffea0001cb5cc0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x72d73
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000800 ffff8880178418c0 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 0x112cc0(GFP_USER|__GFP_NOWARN|__GFP_NORETRY), pid 5908, tgid 5908 (udevd), ts 87750353367, free_ts 87746794222
 set_page_owner include/linux/page_owner.h:31 [inline]
 post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
 prep_new_page mm/page_alloc.c:1561 [inline]
 get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
 __alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
 alloc_slab_page+0x5d/0x170 mm/slub.c:1881
 allocate_slab mm/slub.c:2028 [inline]
 new_slab+0x87/0x2e0 mm/slub.c:2081
 ___slab_alloc+0xc6d/0x1300 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+0x1a2/0x260 mm/slub.c:3534
 kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
 kmalloc include/linux/slab.h:600 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 kernfs_get_open_node fs/kernfs/file.c:592 [inline]
 kernfs_fop_open+0x7d7/0xcc0 fs/kernfs/file.c:760
 do_dentry_open+0x8c6/0x1500 fs/open.c:929
 do_open fs/namei.c:3640 [inline]
 path_openat+0x274b/0x3190 fs/namei.c:3797
 do_filp_open+0x1c5/0x3d0 fs/namei.c:3824
 do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
 do_sys_open fs/open.c:1434 [inline]
 __do_sys_openat fs/open.c:1450 [inline]
 __se_sys_openat fs/open.c:1445 [inline]
 __x64_sys_openat+0x139/0x160 fs/open.c:1445
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1154 [inline]
 free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
 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+0x31d/0x410 mm/slub.c:3700
 qlink_free mm/kasan/quarantine.c:166 [inline]
 qlist_free_all+0x75/0xe0 mm/kasan/quarantine.c:185
 kasan_quarantine_reduce+0x143/0x160 mm/kasan/quarantine.c:292
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:305
 kasan_slab_alloc include/linux/kasan.h:188 [inline]
 slab_post_alloc_hook+0x6e/0x4d0 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+0x11e/0x2e0 mm/slub.c:3519
 getname_flags+0xbb/0x500 fs/namei.c:140
 do_sys_openat2+0xcb/0x1c0 fs/open.c:1413
 do_sys_open fs/open.c:1434 [inline]
 __do_sys_openat fs/open.c:1450 [inline]
 __se_sys_openat fs/open.c:1445 [inline]
 __x64_sys_openat+0x139/0x160 fs/open.c:1445
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Memory state around the buggy address:
 ffff888072d73a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888072d73a80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888072d73b00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
                                                                ^
 ffff888072d73b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888072d73c00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc
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