UDC core: USB Raw Gadget: couldn't find an available UDC or it's busy misc raw-gadget: fail, usb_gadget_register_driver returned -16 ================================================================== BUG: KASAN: invalid-free in f_uac2_opts_p_srate_store+0x224/0x2b0 drivers/usb/gadget/function/f_uac2.c:2087 Free of addr ffff88810d7c88c7 by task syz.0.426/1591 CPU: 0 UID: 0 PID: 1591 Comm: syz.0.426 Not tainted syzkaller #0 45964a5c932d45c81e53484b258bbb49855afb35 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: __dump_stack+0x21/0x30 lib/dump_stack.c:94 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120 print_address_description+0x71/0x210 mm/kasan/report.c:377 print_report+0x4a/0x70 mm/kasan/report.c:481 kasan_report_invalid_free+0x11e/0x160 mm/kasan/report.c:556 check_slab_allocation+0xdf/0xf0 include/linux/page-flags.h:-1 __kasan_slab_pre_free+0x36/0x50 mm/kasan/common.c:257 kasan_slab_pre_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:2390 [inline] slab_free mm/slub.c:4714 [inline] kfree+0xf8/0x440 mm/slub.c:4875 f_uac2_opts_p_srate_store+0x224/0x2b0 drivers/usb/gadget/function/f_uac2.c:2087 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x32c/0x490 fs/configfs/file.c:229 do_iter_readv_writev+0x629/0x820 fs/read_write.c:-1 vfs_writev+0x4a5/0xe90 fs/read_write.c:1076 do_writev+0x151/0x2e0 fs/read_write.c:1123 __do_sys_writev fs/read_write.c:1196 [inline] __se_sys_writev fs/read_write.c:1193 [inline] __x64_sys_writev+0x81/0x90 fs/read_write.c:1193 x64_sys_call+0x1fbb/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:21 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x76/0x7e RIP: 0033:0x7fa608d9de99 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:00007fa609d2d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007fa609025fa0 RCX: 00007fa608d9de99 RDX: 0000000000000007 RSI: 0000200000001a80 RDI: 0000000000000007 RBP: 00007fa608e33eaf R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa609026038 R14: 00007fa609025fa0 R15: 00007ffdab229ba8 Allocated by task 1591: kasan_save_stack mm/kasan/common.c:49 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:70 kasan_save_alloc_info+0x3a/0x50 mm/kasan/generic.c:565 poison_kmalloc_redzone mm/kasan/common.c:379 [inline] __kasan_kmalloc+0x96/0xb0 mm/kasan/common.c:396 kasan_kmalloc include/linux/kasan.h:261 [inline] __do_kmalloc_node mm/slub.c:4395 [inline] __kmalloc_node_track_caller_noprof+0x24e/0x4f0 mm/slub.c:4414 kstrdup+0x4d/0x130 mm/util.c:70 f_uac2_opts_p_srate_store+0x11e/0x2b0 drivers/usb/gadget/function/f_uac2.c:2087 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x32c/0x490 fs/configfs/file.c:229 do_iter_readv_writev+0x629/0x820 fs/read_write.c:-1 vfs_writev+0x4a5/0xe90 fs/read_write.c:1076 do_writev+0x151/0x2e0 fs/read_write.c:1123 __do_sys_writev fs/read_write.c:1196 [inline] __se_sys_writev fs/read_write.c:1193 [inline] __x64_sys_writev+0x81/0x90 fs/read_write.c:1193 x64_sys_call+0x1fbb/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:21 do_syscall_x64 arch/x86/entry/common.c:47 [inline] do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78 entry_SYSCALL_64_after_hwframe+0x76/0x7e The buggy address belongs to the object at ffff88810d7c8800 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 199 bytes inside of 507-byte region [ffff88810d7c8800, ffff88810d7c89fb) The buggy address belongs to the physical page: page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88810d7cb800 pfn:0x10d7c8 head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 anon flags: 0x4000000000000040(head|zone=1) page_type: f5(slab) raw: 4000000000000040 ffff888100041c80 ffffea000437d500 dead000000000003 raw: ffff88810d7cb800 000000008010000d 00000001f5000000 0000000000000000 head: 4000000000000040 ffff888100041c80 ffffea000437d500 dead000000000003 head: ffff88810d7cb800 000000008010000d 00000001f5000000 0000000000000000 head: 4000000000000002 ffffea000435f201 ffffffffffffffff 0000000000000000 head: 0000000000000004 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 99, tgid 99 (klogd), ts 4236696270, free_ts 0 set_page_owner include/linux/page_owner.h:35 [inline] post_alloc_hook+0x37d/0x3b0 mm/page_alloc.c:1863 prep_new_page+0x2d/0x180 mm/page_alloc.c:1871 get_page_from_freelist+0x4aea/0x4ba0 mm/page_alloc.c:3948 __alloc_pages_noprof+0x35a/0x7e0 mm/page_alloc.c:5315 alloc_slab_page+0x6b/0x1e0 mm/slub.c:-1 allocate_slab+0x69/0x430 mm/slub.c:2687 new_slab mm/slub.c:2741 [inline] ___slab_alloc+0x591/0x8c0 mm/slub.c:3934 __slab_alloc mm/slub.c:4025 [inline] __slab_alloc_node mm/slub.c:4078 [inline] slab_alloc_node mm/slub.c:4239 [inline] __do_kmalloc_node mm/slub.c:4394 [inline] __kmalloc_node_track_caller_noprof+0x2e3/0x4f0 mm/slub.c:4414 kmalloc_reserve+0x144/0x4f0 net/core/skbuff.c:618 __alloc_skb+0x13f/0x360 net/core/skbuff.c:687 alloc_skb include/linux/skbuff.h:1363 [inline] alloc_skb_with_frags+0xd0/0x8b0 net/core/skbuff.c:6617 sock_alloc_send_pskb+0x883/0x9a0 net/core/sock.c:2923 unix_dgram_sendmsg+0x63a/0x1a90 net/unix/af_unix.c:2040 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x68a/0x700 net/socket.c:2216 __do_sys_sendto net/socket.c:2228 [inline] __se_sys_sendto net/socket.c:2224 [inline] __x64_sys_sendto+0xe9/0x100 net/socket.c:2224 x64_sys_call+0x2c2c/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:45 page_owner free stack trace missing Memory state around the buggy address: ffff88810d7c8780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88810d7c8800: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88810d7c8880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88810d7c8900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88810d7c8980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 ==================================================================