Hello, syzbot found the following issue on: HEAD commit: c8c109546a19 Merge tag 'zstd-for-linus-v5.16' of git://git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17745dd6b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=a262045c4c15a9e0 dashboard link: https://syzkaller.appspot.com/bug?extid=6dc37929ddaf9d677b2b compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6dc37929ddaf9d677b2b@xxxxxxxxxxxxxxxxxxxxxxxxx ================================================================== BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user include/linux/instrumented.h:118 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_user lib/usercopy.c:32 [inline] BUG: KASAN: slab-out-of-bounds in _copy_to_user+0xc7/0x150 lib/usercopy.c:26 Read of size 2 at addr ffff88803545b460 by task syz-executor.0/6756 CPU: 0 PID: 6756 Comm: syz-executor.0 Not tainted 5.15.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 print_address_description.constprop.0.cold+0x8d/0x320 mm/kasan/report.c:247 __kasan_report mm/kasan/report.c:433 [inline] kasan_report.cold+0x83/0xdf mm/kasan/report.c:450 check_region_inline mm/kasan/generic.c:183 [inline] kasan_check_range+0x13d/0x180 mm/kasan/generic.c:189 instrument_copy_to_user include/linux/instrumented.h:118 [inline] _copy_to_user lib/usercopy.c:32 [inline] _copy_to_user+0xc7/0x150 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:200 [inline] copy_urb_data_to_user+0x34c/0x400 drivers/usb/core/devio.c:544 processcompl+0x5ab/0x680 drivers/usb/core/devio.c:2024 proc_reapurbnonblock drivers/usb/core/devio.c:2101 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2594 [inline] usbdev_ioctl+0x2d7/0x36c0 drivers/usb/core/devio.c:2791 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f1326280ae9 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f13237d5188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1326394020 RCX: 00007f1326280ae9 RDX: 0000000020000080 RSI: 000000004008550d RDI: 0000000000000004 RBP: 00007f13262daf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f13268c7b2f R14: 00007f13237d5300 R15: 0000000000022000 </TASK> Allocated by task 6748: kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:434 [inline] ____kasan_kmalloc mm/kasan/common.c:513 [inline] ____kasan_kmalloc mm/kasan/common.c:472 [inline] __kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522 kmalloc include/linux/slab.h:595 [inline] proc_do_submiturb+0x2a7d/0x3630 drivers/usb/core/devio.c:1816 proc_submiturb drivers/usb/core/devio.c:1975 [inline] usbdev_do_ioctl drivers/usb/core/devio.c:2671 [inline] usbdev_ioctl+0x692/0x36c0 drivers/usb/core/devio.c:2791 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae The buggy address belongs to the object at ffff88803545b460 which belongs to the cache kmalloc-8 of size 8 The buggy address is located 0 bytes inside of 8-byte region [ffff88803545b460, ffff88803545b468) The buggy address belongs to the page: page:ffffea0000d516c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3545b flags: 0xfff00000000200(slab|node=0|zone=1|lastcpupid=0x7ff) raw: 00fff00000000200 ffffea000221b6c0 dead000000000002 ffff888010c41280 raw: 0000000000000000 0000000080660066 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 0x12cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY), pid 25813, ts 1988498379208, free_ts 1988486053407 prep_new_page mm/page_alloc.c:2418 [inline] get_page_from_freelist+0xa72/0x2f50 mm/page_alloc.c:4149 __alloc_pages+0x1b2/0x500 mm/page_alloc.c:5369 alloc_pages+0x1a7/0x300 mm/mempolicy.c:2191 alloc_slab_page mm/slub.c:1793 [inline] allocate_slab mm/slub.c:1930 [inline] new_slab+0x32d/0x4a0 mm/slub.c:1993 ___slab_alloc+0x918/0xfe0 mm/slub.c:3022 __slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109 slab_alloc_node mm/slub.c:3200 [inline] slab_alloc mm/slub.c:3242 [inline] __kmalloc_track_caller+0x2e7/0x320 mm/slub.c:4925 kmemdup+0x23/0x50 mm/util.c:128 kmemdup include/linux/fortify-string.h:304 [inline] ip6_opt_dup net/ipv6/ip6_output.c:1318 [inline] ip6_setup_cork+0x686/0x1780 net/ipv6/ip6_output.c:1384 ip6_make_skb+0x22d/0x550 net/ipv6/ip6_output.c:1983 udpv6_sendmsg+0x22d6/0x2c40 net/ipv6/udp.c:1541 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:644 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x331/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmmsg+0x195/0x470 net/socket.c:2549 page last free stack trace: reset_page_owner include/linux/page_owner.h:24 [inline] free_pages_prepare mm/page_alloc.c:1338 [inline] free_pcp_prepare+0x374/0x870 mm/page_alloc.c:1389 free_unref_page_prepare mm/page_alloc.c:3309 [inline] free_unref_page+0x19/0x690 mm/page_alloc.c:3388 mm_free_pgd kernel/fork.c:647 [inline] __mmdrop+0xcb/0x3f0 kernel/fork.c:698 mmdrop include/linux/sched/mm.h:49 [inline] __mmput+0x3f1/0x4b0 kernel/fork.c:1123 mmput+0x56/0x60 kernel/fork.c:1134 free_bprm+0x65/0x2e0 fs/exec.c:1481 kernel_execve+0x380/0x460 fs/exec.c:1978 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Memory state around the buggy address: ffff88803545b300: fc fc fc fc fa fc fc fc fc fb fc fc fc fc 00 fc ffff88803545b380: fc fc fc fa fc fc fc fc fa fc fc fc fc fa fc fc >ffff88803545b400: fc fc fb fc fc fc fc fa fc fc fc fc 01 fc fc fc ^ ffff88803545b480: fc 00 fc fc fc fc 00 fc fc fc fc 00 fc fc fc fc ffff88803545b500: fa fc fc fc fc fa fc fc fc fc fa fc fc fc fc fa ================================================================== --- This report is generated by a bot. 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