================================================================== BUG: KASAN: slab-out-of-bounds in copy_to_urb.constprop.0+0x30f/0x440 sound/usb/pcm.c:1487 Write of size 264 at addr ffff888053f4e600 by task syz.5.1016/9840 CPU: 1 UID: 0 PID: 9840 Comm: syz.5.1016 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 check_region_inline mm/kasan/generic.c:194 [inline] kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:200 __asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106 copy_to_urb.constprop.0+0x30f/0x440 sound/usb/pcm.c:1487 prepare_playback_urb+0xc3b/0x1e70 sound/usb/pcm.c:1611 prepare_outbound_urb+0x419/0xdd0 sound/usb/endpoint.c:333 snd_usb_endpoint_start+0x42c/0x1040 sound/usb/endpoint.c:1596 start_endpoints+0xfb/0x1d0 sound/usb/pcm.c:291 snd_usb_substream_playback_trigger+0x6a0/0x870 sound/usb/pcm.c:1711 snd_pcm_do_start sound/core/pcm_native.c:1454 [inline] snd_pcm_do_start+0xd4/0x1f0 sound/core/pcm_native.c:1447 snd_pcm_action_single+0x80/0x150 sound/core/pcm_native.c:1310 snd_pcm_action+0x70/0x90 sound/core/pcm_native.c:1393 __snd_pcm_lib_xfer+0x1403/0x1ef0 sound/core/pcm_lib.c:2405 snd_pcm_oss_write3+0xcf/0x1e0 sound/core/oss/pcm_oss.c:1241 io_playback_transfer+0x26e/0x2f0 sound/core/oss/io.c:47 snd_pcm_plug_write_transfer+0x2cf/0x400 sound/core/oss/pcm_plugin.c:630 snd_pcm_oss_write2+0x24a/0x410 sound/core/oss/pcm_oss.c:1373 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1439 [inline] snd_pcm_oss_write+0x710/0xa10 sound/core/oss/pcm_oss.c:2794 vfs_write+0x2a0/0x11d0 fs/read_write.c:684 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe8/0x680 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f53579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f542555c EFLAGS: 00000296 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 000000000000000d RCX: 0000000080000640 RDX: 00000000000005ce RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 Allocated by task 9840: kasan_save_stack+0x33/0x60 mm/kasan/common.c:56 kasan_save_track+0x14/0x30 mm/kasan/common.c:77 poison_kmalloc_redzone mm/kasan/common.c:397 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:414 kasan_kmalloc include/linux/kasan.h:262 [inline] __do_kmalloc_node mm/slub.c:5652 [inline] __kmalloc_noprof+0x33d/0x910 mm/slub.c:5664 kmalloc_noprof include/linux/slab.h:961 [inline] hcd_buffer_alloc+0x1f5/0x290 drivers/usb/core/buffer.c:134 usb_alloc_coherent+0x5f/0xa0 drivers/usb/core/usb.c:1010 data_ep_set_params sound/usb/endpoint.c:1242 [inline] snd_usb_endpoint_set_params+0x18c8/0x2980 sound/usb/endpoint.c:1379 snd_usb_hw_params+0x715/0x1070 sound/usb/pcm.c:576 snd_pcm_hw_params+0xafc/0x1ba0 sound/core/pcm_native.c:804 snd_pcm_kernel_ioctl+0x147/0x2e0 sound/core/pcm_native.c:3499 snd_pcm_oss_change_params_locked+0x15ab/0x3ab0 sound/core/oss/pcm_oss.c:965 snd_pcm_oss_make_ready_locked+0xb7/0x130 sound/core/oss/pcm_oss.c:1186 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1404 [inline] snd_pcm_oss_write+0x4c2/0xa10 sound/core/oss/pcm_oss.c:2794 vfs_write+0x2a0/0x11d0 fs/read_write.c:684 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe8/0x680 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x80 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e The buggy address belongs to the object at ffff888053f4e600 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes inside of allocated 240-byte region [ffff888053f4e600, ffff888053f4e6f0) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x53f4e head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff) page_type: f5(slab) raw: 04fff00000000040 ffff88801b442b40 dead000000000100 dead000000000122 raw: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 04fff00000000040 ffff88801b442b40 dead000000000100 dead000000000122 head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000 head: 04fff00000000001 ffffea00014fd381 00000000ffffffff 00000000ffffffff head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000002 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 1, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 3711, tgid 3704 (syz.4.836), ts 220717888835, free_ts 206411797545 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x1af/0x220 mm/page_alloc.c:1846 prep_new_page mm/page_alloc.c:1854 [inline] get_page_from_freelist+0xd0b/0x31a0 mm/page_alloc.c:3915 __alloc_frozen_pages_noprof+0x25f/0x2430 mm/page_alloc.c:5210 alloc_slab_page mm/slub.c:3077 [inline] allocate_slab mm/slub.c:3248 [inline] new_slab+0xaf/0x430 mm/slub.c:3302 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4651 __slab_alloc.constprop.0+0x63/0x110 mm/slub.c:4774 __slab_alloc_node mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:5246 [inline] __do_kmalloc_node mm/slub.c:5651 [inline] __kmalloc_node_noprof+0x4d8/0x930 mm/slub.c:5658 kmalloc_array_node_noprof include/linux/slab.h:1075 [inline] alloc_slab_obj_exts+0x43/0xf0 mm/slub.c:2123 account_slab mm/slub.c:3202 [inline] allocate_slab mm/slub.c:3267 [inline] new_slab+0x353/0x430 mm/slub.c:3302 ___slab_alloc+0xe18/0x1c90 mm/slub.c:4651 __kmem_cache_alloc_bulk+0x1fb/0x6c0 mm/slub.c:7424 kmem_cache_alloc_bulk_noprof+0x4e1/0x800 mm/slub.c:7490 __io_alloc_req_refill+0x9d/0x5e0 io_uring/io_uring.c:1025 io_alloc_req io_uring/io_uring.h:562 [inline] io_submit_sqes+0xf94/0x28e0 io_uring/io_uring.c:2423 __do_sys_io_uring_enter+0xd6b/0x1630 io_uring/io_uring.c:3277 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe8/0x680 arch/x86/entry/syscall_32.c:307 page last free pid 6326 tgid 6326 stack trace: reset_page_owner include/linux/page_owner.h:25 [inline] free_pages_prepare mm/page_alloc.c:1395 [inline] __free_frozen_pages+0x7df/0x1170 mm/page_alloc.c:2943 kasan_depopulate_vmalloc_pte+0x5b/0x80 mm/kasan/shadow.c:484 apply_to_pte_range mm/memory.c:3182 [inline] apply_to_pmd_range mm/memory.c:3226 [inline] apply_to_pud_range mm/memory.c:3262 [inline] apply_to_p4d_range mm/memory.c:3298 [inline] __apply_to_page_range+0xac1/0x13f0 mm/memory.c:3334 __kasan_release_vmalloc+0xd1/0xe0 mm/kasan/shadow.c:602 kasan_release_vmalloc include/linux/kasan.h:592 [inline] kasan_release_vmalloc_node mm/vmalloc.c:2282 [inline] purge_vmap_node+0x1ba/0xad0 mm/vmalloc.c:2299 __purge_vmap_area_lazy+0x9d2/0xc00 mm/vmalloc.c:2389 drain_vmap_area_work+0x27/0x40 mm/vmalloc.c:2423 process_one_work+0x9ba/0x1b20 kernel/workqueue.c:3257 process_scheduled_works kernel/workqueue.c:3340 [inline] worker_thread+0x6c8/0xf10 kernel/workqueue.c:3421 kthread+0x3c5/0x780 kernel/kthread.c:463 ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 Memory state around the buggy address: ffff888053f4e580: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888053f4e600: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff888053f4e680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc ^ ffff888053f4e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff888053f4e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ================================================================== ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi