================================================================== BUG: KASAN: slab-out-of-bounds in copy_to_urb+0x21f/0x410 sound/usb/pcm.c:1393 Write of size 264 at addr ffff888056263500 by task syz.2.297/5496 CPU: 0 PID: 5496 Comm: syz.2.297 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106 print_address_description mm/kasan/report.c:316 [inline] print_report+0xa8/0x210 mm/kasan/report.c:420 kasan_report+0x10b/0x140 mm/kasan/report.c:524 check_region_inline mm/kasan/generic.c:-1 [inline] kasan_check_range+0x27b/0x290 mm/kasan/generic.c:189 memcpy+0x3c/0x60 mm/kasan/shadow.c:66 copy_to_urb+0x21f/0x410 sound/usb/pcm.c:1393 prepare_playback_urb+0x912/0x1440 sound/usb/pcm.c:1521 snd_usb_endpoint_start+0x49c/0x1280 sound/usb/endpoint.c:1614 start_endpoints+0xa1/0x270 sound/usb/pcm.c:273 snd_usb_substream_playback_trigger+0x3eb/0x7d0 sound/usb/pcm.c:1625 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+0x179f/0x1c70 sound/core/pcm_lib.c:2310 snd_pcm_oss_write3+0x1b8/0x310 sound/core/oss/pcm_oss.c:1252 snd_pcm_plug_write_transfer+0x2b4/0x4a0 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+0xbae/0x1110 sound/core/oss/pcm_oss.c:2810 vfs_write+0x2c4/0x960 fs/read_write.c:582 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f8633d8f749 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:00007f8634c7a038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f8633fe5fa0 RCX: 00007f8633d8f749 RDX: 00000000000005ce RSI: 0000200000000640 RDI: 0000000000000004 RBP: 00007f8633e13f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8633fe6038 R14: 00007f8633fe5fa0 R15: 00007fff6f68daa8 Allocated by task 5496: kasan_save_stack mm/kasan/common.c:45 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:52 ____kasan_kmalloc mm/kasan/common.c:374 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:383 kasan_kmalloc include/linux/kasan.h:211 [inline] __do_kmalloc_node mm/slab_common.c:936 [inline] __kmalloc+0xb0/0x240 mm/slab_common.c:949 data_ep_set_params sound/usb/endpoint.c:1259 [inline] snd_usb_endpoint_set_params+0x16bb/0x2a50 sound/usb/endpoint.c:1391 snd_usb_hw_params+0x123a/0x19b0 sound/usb/pcm.c:569 snd_pcm_hw_params+0x829/0x1c50 sound/core/pcm_native.c:779 snd_pcm_oss_change_params_locked+0x222c/0x3ee0 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+0x2f8/0x1110 sound/core/oss/pcm_oss.c:2810 vfs_write+0x2c4/0x960 fs/read_write.c:582 ksys_write+0x143/0x240 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888056263500 which belongs to the cache kmalloc-128 of size 128 The buggy address is located 0 bytes inside of 128-byte region [ffff888056263500, ffff888056263580) The buggy address belongs to the physical page: page:ffffea00015898c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x56263 flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 0000000000000000 dead000000000001 ffff8880174418c0 raw: 0000000000000000 0000000000100010 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 0x12a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY), pid 4318, tgid 4318 (kworker/1:3), ts 61927953215, free_ts 11843028032 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532 prep_new_page mm/page_alloc.c:2539 [inline] get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328 __alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614 alloc_slab_page+0x5d/0x160 mm/slub.c:1799 allocate_slab mm/slub.c:1944 [inline] new_slab+0x87/0x2c0 mm/slub.c:1997 ___slab_alloc+0xbc6/0x1230 mm/slub.c:3154 __slab_alloc mm/slub.c:3240 [inline] slab_alloc_node mm/slub.c:3325 [inline] __kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398 kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026 kmalloc include/linux/slab.h:563 [inline] __hw_addr_create net/core/dev_addr_lists.c:60 [inline] __hw_addr_add_ex+0x1f4/0x760 net/core/dev_addr_lists.c:118 __dev_mc_add net/core/dev_addr_lists.c:867 [inline] dev_mc_add+0x9d/0x110 net/core/dev_addr_lists.c:885 igmp6_group_added+0x1a1/0x530 net/ipv6/mcast.c:680 __ipv6_dev_mc_inc+0x8e5/0xa90 net/ipv6/mcast.c:948 addrconf_join_solict net/ipv6/addrconf.c:2197 [inline] addrconf_dad_begin net/ipv6/addrconf.c:4039 [inline] addrconf_dad_work+0x3b9/0x14d0 net/ipv6/addrconf.c:4164 process_one_work+0x898/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1459 [inline] free_pcp_prepare mm/page_alloc.c:1509 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384 free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479 free_contig_range+0x9d/0x150 mm/page_alloc.c:9574 destroy_args+0x100/0xa31 mm/debug_vm_pgtable.c:1031 debug_vm_pgtable+0x32a/0x37e mm/debug_vm_pgtable.c:1359 do_one_initcall+0x214/0x7a0 init/main.c:1310 do_initcall_level+0x137/0x1e4 init/main.c:1383 do_initcalls+0x4b/0x8a init/main.c:1399 kernel_init_freeable+0x3fa/0x5ac init/main.c:1638 kernel_init+0x19/0x1b0 init/main.c:1526 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888056263400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff888056263480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff888056263500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc ^ ffff888056263580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888056263600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================