================================================================== BUG: KASAN: slab-out-of-bounds in copy_to_urb+0x21f/0x410 sound/usb/pcm.c:1393 Write of size 264 at addr ffff888028a6b900 by task syz.1.228/5185 CPU: 0 PID: 5185 Comm: syz.1.228 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Call Trace: dump_stack_lvl+0x188/0x24e 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+0x235/0x290 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+0x910/0x1440 sound/usb/pcm.c:1521 snd_usb_endpoint_start+0x4a6/0x12e0 sound/usb/endpoint.c:1620 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:1298 [inline] snd_pcm_action+0xda/0x230 sound/core/pcm_native.c:1381 __snd_pcm_lib_xfer+0x17ba/0x1c90 sound/core/pcm_lib.c:2310 snd_pcm_oss_write3+0x1b8/0x310 sound/core/oss/pcm_oss.c:1254 snd_pcm_plug_write_transfer+0x2ba/0x4b0 sound/core/oss/pcm_plugin.c:630 snd_pcm_oss_write2+0x1a5/0x410 sound/core/oss/pcm_oss.c:1386 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1452 [inline] snd_pcm_oss_write+0x6a7/0xaf0 sound/core/oss/pcm_oss.c:2812 vfs_write+0x2e6/0xa30 fs/read_write.c:582 ksys_write+0x14c/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f85ab99bf79 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:00007f85ac824028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f85abc15fa0 RCX: 00007f85ab99bf79 RDX: 00000000000005ce RSI: 0000200000000640 RDI: 0000000000000007 RBP: 00007f85aba327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f85abc16038 R14: 00007f85abc15fa0 R15: 00007fff54195ed8 Allocated by task 5185: kasan_save_stack mm/kasan/common.c:46 [inline] kasan_set_track+0x4b/0x70 mm/kasan/common.c:53 ____kasan_kmalloc mm/kasan/common.c:375 [inline] __kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:384 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+0x17f5/0x2f00 sound/usb/endpoint.c:1397 snd_usb_hw_params+0x1239/0x19d0 sound/usb/pcm.c:569 snd_pcm_hw_params+0x8a2/0x1ce0 sound/core/pcm_native.c:784 snd_pcm_oss_change_params_locked+0x2062/0x3c60 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+0x277/0xaf0 sound/core/oss/pcm_oss.c:2812 vfs_write+0x2e6/0xa30 fs/read_write.c:582 ksys_write+0x14c/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 Last potentially related work creation: kasan_save_stack+0x3a/0x60 mm/kasan/common.c:46 __kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486 insert_work+0x54/0x3c0 kernel/workqueue.c:1361 __queue_work+0xba3/0xfb0 kernel/workqueue.c:1520 queue_work_on+0x124/0x1f0 kernel/workqueue.c:1548 queue_work include/linux/workqueue.h:512 [inline] netdevice_queue_work drivers/infiniband/core/roce_gid_mgmt.c:659 [inline] netdevice_event+0x802/0x900 drivers/infiniband/core/roce_gid_mgmt.c:802 notifier_call_chain kernel/notifier.c:87 [inline] raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455 call_netdevice_notifiers_extack net/core/dev.c:2052 [inline] call_netdevice_notifiers net/core/dev.c:2066 [inline] dev_set_mac_address+0x2e8/0x400 net/core/dev.c:8911 dev_set_mac_address_user+0x2d/0x50 net/core/dev.c:8925 do_setlink+0x79a/0x3e60 net/core/rtnetlink.c:2788 __rtnl_newlink net/core/rtnetlink.c:3608 [inline] rtnl_newlink+0x177c/0x2080 net/core/rtnetlink.c:3655 rtnetlink_rcv_msg+0x87c/0xfc0 net/core/rtnetlink.c:6150 netlink_rcv_skb+0x1fb/0x450 net/netlink/af_netlink.c:2511 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline] netlink_unicast+0x74d/0x8d0 net/netlink/af_netlink.c:1344 netlink_sendmsg+0x8ad/0xbd0 net/netlink/af_netlink.c:1872 sock_sendmsg_nosec net/socket.c:718 [inline] __sock_sendmsg net/socket.c:730 [inline] __sys_sendto+0x497/0x650 net/socket.c:2152 __do_sys_sendto net/socket.c:2164 [inline] __se_sys_sendto net/socket.c:2160 [inline] __x64_sys_sendto+0xda/0xf0 net/socket.c:2160 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 The buggy address belongs to the object at ffff888028a6b900 which belongs to the cache kmalloc-192 of size 192 The buggy address is located 0 bytes inside of 192-byte region [ffff888028a6b900, ffff888028a6b9c0) The buggy address belongs to the physical page: page:ffffea0000a29ac0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x28a6b flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000076da00 dead000000000005 ffff888017441a00 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 0x12c00(GFP_NOIO|__GFP_NOWARN|__GFP_NORETRY), pid 125, tgid 125 (kworker/1:2), ts 8927939988, free_ts 8886187410 set_page_owner include/linux/page_owner.h:31 [inline] post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2559 prep_new_page mm/page_alloc.c:2566 [inline] get_page_from_freelist+0x1a1e/0x1ab0 mm/page_alloc.c:4357 __alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5643 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+0xbc6/0x1240 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 __do_kmalloc_node mm/slab_common.c:935 [inline] __kmalloc+0xa0/0x240 mm/slab_common.c:949 kmalloc include/linux/slab.h:568 [inline] usb_alloc_urb+0x3f/0x140 drivers/usb/core/urb.c:75 usb_internal_control_msg drivers/usb/core/message.c:95 [inline] usb_control_msg+0x115/0x3e0 drivers/usb/core/message.c:153 get_port_status drivers/usb/core/hub.c:609 [inline] hub_ext_port_status+0x103/0x6d0 drivers/usb/core/hub.c:626 usb_hub_port_status drivers/usb/core/hub.c:648 [inline] hub_activate+0x77b/0x1a60 drivers/usb/core/hub.c:1159 process_one_work+0x8a2/0x1160 kernel/workqueue.c:2292 worker_thread+0xaa2/0x1270 kernel/workqueue.c:2439 kthread+0x29d/0x330 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1486 [inline] free_pcp_prepare mm/page_alloc.c:1536 [inline] free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3413 free_unref_page_list+0xbb/0x8e0 mm/page_alloc.c:3554 release_pages+0x1fa6/0x2220 mm/swap.c:1035 tlb_batch_pages_flush mm/mmu_gather.c:59 [inline] tlb_flush_mmu_free mm/mmu_gather.c:254 [inline] tlb_flush_mmu+0x105/0x220 mm/mmu_gather.c:261 tlb_finish_mmu+0xbd/0x1c0 mm/mmu_gather.c:361 exit_mmap+0x384/0x960 mm/mmap.c:3262 __mmput+0x118/0x3c0 kernel/fork.c:1205 free_bprm+0x141/0x300 fs/exec.c:1515 kernel_execve+0x3be/0x9c0 fs/exec.c:2041 call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff888028a6b880: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff888028a6b900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888028a6b980: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc ^ ffff888028a6ba00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888028a6ba80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ==================================================================