From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo2-f4.google.com (mail-oo2-f4.google.com [74.125.231.132]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ECBF82F7AD2 for ; Wed, 23 Sep 2026 00:33:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.132 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790123606; cv=none; b=YH+TDL1hW3PZAzFdnkBxXAP+VLqk58SkgGqbCbeEbNI+oGB3obs+4RUKCwe5u0kvkBWIa3S6+mo0yDWSQD6PQjjGE1Xu8gxHwa0iccKsIk87pei5kvj5Tr1kmp1EY8GlFNm59uESG+sY15qyAYiF+LTpLLg/bkFlVPF5Vl8Pupg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790123606; c=relaxed/simple; bh=sUo0eeU9dqLm3x/b4GdwnnnVIPDwHP9vuivKkMgRwQM=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=DNPgG4mF3A5ipUX5JRW/hTYkTPoohIj+LmNzw4U2nyasSLfVxBdNxMNYx+mdTP7H36o6HDVtcRpics17p2rF1X3YN/RDwVvGMaxVuwB82+WpEqAlQQhzqRzBO0+ZDEkNx94ATTOsidOnnEVVq5zGbrqtAIQG6H6687J4aNNsAWk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=74.125.231.132 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-oo2-f4.google.com with SMTP id 006d021491bc7-6d26562298dso135129eaf.0 for ; Tue, 22 Sep 2026 17:33:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1790123604; x=1790728404; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=26acOs9A2D4oBmB7TKWMEDIcWIuf7VT+CiNnxN/eHn0=; b=0GXKqTiWzmUhsjMi24Rtu7AzeX/vGp11CkBmqSP+o2TAPsfQRL4OxkGKrN4sm42PiL 6pgLrNMQZYtaomFIbz6Cx76zM7TQdT7gQLABeRqiKbJJWF+ueYWLogXdXDj4Y8BcwhA4 Kma0Qoc1cR1x5UsRttLqGR6JRxGVIAGUh6JiOaUa5/K5s3UOpopHcdZWWWqNHYaBk6qQ NYMp/0eLsLU2wnmI9dlWNninANqpdTGBNOI4nMbxnIVJcaGh+sFVG0mg0RlVlxioyGA0 DXtipTID+zLvsr3hYV0QKv8q8kBvXXVe6A0FBEd6q1+wEIAOTKRn+UsNUQAtxVum6kgf qjpQ== X-Gm-Message-State: AFuF++nGPKl+XZHbJIsTOm2KA28/QjnDPG9CPk2av/+NmY4YNvSE9Fe6 tFErsfx+F7NXhuHjHyaRiZdnnnlbfu3tAyZzZyd3+6gDyHWY0aG0LF24RrfG5BvMq8YBpOynQO7 q7himn3DiDOx807P+HKUgWqGf0I70gIftj/rUiMPJYkJtaTzOXDLkJWJD/JwVMw== Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:1524:b0:6cd:3fdb:fa65 with SMTP id 006d021491bc7-6d2d3908806mr979955eaf.80.1790123603977; Tue, 22 Sep 2026 17:33:23 -0700 (PDT) Date: Tue, 22 Sep 2026 17:33:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6ab31e53.3179f8cd.1e36b2.002e.GAE@google.com> Subject: [syzbot] [mmc?] KASAN: slab-use-after-free Write in ms_read_bytes From: syzbot To: linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-usb@vger.kernel.org, maximlevitsky@gmail.com, oakad@yahoo.com, syzkaller-bugs@googlegroups.com, ulf.hansson@linaro.org, ulfh@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d58dffe9ee2c USB: core: amend usb_get_from_anchor() kernel.. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=112d0515580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c451f9f64434b622 dashboard link: https://syzkaller.appspot.com/bug?extid=ccffdf05833ebdaeae70 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/424c61cbb872/disk-d58dffe9.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/4124586dc97c/vmlinux-d58dffe9.xz kernel image: https://storage.googleapis.com/syzbot-assets/a07e8e384dc4/bzImage-d58dffe9.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ccffdf05833ebdaeae70@syzkaller.appspotmail.com ========= ================================================================== BUG: KASAN: slab-use-after-free in ms_read_bytes+0x8fe/0x990 drivers/memstick/host/rtsx_usb_ms.c:450 Write of size 1 at addr ffff88813c188079 by task kworker/1:5/5239 CPU: 1 UID: 0 PID: 5239 Comm: kworker/1:5 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: events rtsx_usb_ms_handle_req Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0x13d/0x4b0 mm/kasan/report.c:482 kasan_report+0xdf/0x1c0 mm/kasan/report.c:595 ms_read_bytes+0x8fe/0x990 drivers/memstick/host/rtsx_usb_ms.c:450 rtsx_usb_ms_issue_cmd drivers/memstick/host/rtsx_usb_ms.c:477 [inline] rtsx_usb_ms_handle_req+0x557/0x1a00 drivers/memstick/host/rtsx_usb_ms.c:531 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x69f/0xc90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Allocated by task 1662: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 poison_kmalloc_redzone mm/kasan/common.c:398 [inline] __kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:415 kasan_kmalloc include/linux/kasan.h:263 [inline] __kmalloc_cache_noprof+0x2d8/0x680 mm/slub.c:5563 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] memstick_alloc_card drivers/memstick/core/memstick.c:383 [inline] memstick_check+0x2c1/0x10d0 drivers/memstick/core/memstick.c:452 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x69f/0xc90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Freed by task 1662: kasan_save_stack+0x30/0x50 mm/kasan/common.c:57 kasan_save_track+0x14/0x30 mm/kasan/common.c:78 kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584 poison_slab_object mm/kasan/common.c:253 [inline] __kasan_slab_free+0x43/0x70 mm/kasan/common.c:285 kasan_slab_free include/linux/kasan.h:235 [inline] slab_free_hook mm/slub.c:2748 [inline] slab_free mm/slub.c:6499 [inline] kfree+0x20c/0x650 mm/slub.c:6792 memstick_alloc_card drivers/memstick/core/memstick.c:420 [inline] memstick_check+0x72b/0x10d0 drivers/memstick/core/memstick.c:452 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x69f/0xc90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 The buggy address belongs to the object at ffff88813c188000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 121 bytes inside of freed 2048-byte region [ffff88813c188000, ffff88813c188800) The buggy address belongs to the physical page: page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x13c188 head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0x200000000000040(head|node=0|zone=2) page_type: f5(slab) raw: 0200000000000040 ffff888100042000 dead000000000100 dead000000000122 raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 0200000000000040 ffff888100042000 dead000000000100 dead000000000122 head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000 head: 0200000000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000008 page dumped because: kasan: bad access detected page_owner tracks the page as allocated page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 24, tgid 24 (kworker/1:0), ts 137296809400 set_page_owner include/linux/page_owner.h:33 [inline] post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871 prep_new_page mm/page_alloc.c:1879 [inline] get_page_from_freelist+0xf4b/0x3440 mm/page_alloc.c:3943 __alloc_frozen_pages_noprof+0x2d7/0x2f70 mm/page_alloc.c:5436 alloc_slab_page mm/slub.c:3347 [inline] allocate_slab mm/slub.c:3462 [inline] new_slab+0xa9/0x6e0 mm/slub.c:3513 refill_objects+0xe3/0x410 mm/slub.c:7410 refill_sheaf mm/slub.c:2885 [inline] __pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774 alloc_from_pcs mm/slub.c:4850 [inline] slab_alloc_node mm/slub.c:4984 [inline] __kmalloc_cache_noprof+0x4a1/0x680 mm/slub.c:5559 _kmalloc_noprof include/linux/slab.h:991 [inline] _kzalloc_noprof include/linux/slab.h:1312 [inline] usb_alloc_dev+0x55/0x1090 drivers/usb/core/usb.c:651 hub_port_connect drivers/usb/core/hub.c:5483 [inline] hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] port_event drivers/usb/core/hub.c:5884 [inline] hub_event+0x2c5d/0x4510 drivers/usb/core/hub.c:5966 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x69f/0xc90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 page_owner free stack trace missing Memory state around the buggy address: ffff88813c187f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ffff88813c187f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc >ffff88813c188000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88813c188080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88813c188100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup