From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 31EDEC77B73 for ; Sat, 27 May 2023 04:08:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229755AbjE0EIA (ORCPT ); Sat, 27 May 2023 00:08:00 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37684 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229563AbjE0EH7 (ORCPT ); Sat, 27 May 2023 00:07:59 -0400 Received: from mail-io1-f79.google.com (mail-io1-f79.google.com [209.85.166.79]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C23E3D7 for ; Fri, 26 May 2023 21:07:57 -0700 (PDT) Received: by mail-io1-f79.google.com with SMTP id ca18e2360f4ac-7770a902912so126745839f.0 for ; Fri, 26 May 2023 21:07:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1685160477; x=1687752477; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=og6UtUeC+pLxUZgl9VzEH4M2+sg4+aBhsCxUjilFULM=; b=k4LDkryRIlUqdIR6UQKvSPeYvbgRm8BmvhBmq84xJm/n5hJGH32TTwTggx12nrMqxA JSGoe9L+VE9WBRPpDSFZcUmfzfcRp68BkrcAQ1oQpXykq+85RpOtk5sp4H2EUhUcImPa YLybLXONcxCCyVgm/wGmd8bNr9tSD8IOOhtm7zv4IR31bAMvzAjBXO6E4oIpuSkiEyLM Gr0ZKfZTCelKX6ptarPDTfR/lesQe3CP1jwHcL33xBgO13omLcdY/Lc2TAPL7cgcC242 pV+qnbVTtxUTw5VSbZDhvMu4gxt2j4+8HFO5hc5NLV7khTabKOhWTVeBCUWHER46XWYI PRiA== X-Gm-Message-State: AC+VfDyh+27CPlLXd9e2T3cu4O/4sLWo2GBwrjkBtExoxeNocUM28lNE yAaBL2c9GYJvqA/x73+8pJ3fZu5oEt/OhHYKOFx8Mz2qlvSj X-Google-Smtp-Source: ACHHUZ47yXG7WzTJ/1yLZfKlxpXNfyJzPF1wa9gbxlHYwnOYSeuoXgJ9LJIrtAotA+fA97FK9z48oDwVa6QIRuxQZ6rMsGIG6htg MIME-Version: 1.0 X-Received: by 2002:a02:9584:0:b0:41c:feac:7a9c with SMTP id b4-20020a029584000000b0041cfeac7a9cmr604892jai.6.1685160477152; Fri, 26 May 2023 21:07:57 -0700 (PDT) Date: Fri, 26 May 2023 21:07:57 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000a15f4b05fca4ffa0@google.com> Subject: [syzbot] [fbdev?] general protection fault in soft_cursor From: syzbot To: daniel@ffwll.ch, deller@gmx.de, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-fbdev@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: eb0f1697d729 Merge branch 'for-next/core', remote-tracking.. git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=10e08bde280000 kernel config: https://syzkaller.appspot.com/x/.config?x=8860074b9a9d6c45 dashboard link: https://syzkaller.appspot.com/bug?extid=d910bd780e6efac35869 compiler: Debian clang version 15.0.7, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=103d17a9280000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1151bb19280000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/034232da7cff/disk-eb0f1697.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b11411bec33e/vmlinux-eb0f1697.xz kernel image: https://storage.googleapis.com/syzbot-assets/a53c52e170dd/Image-eb0f1697.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+d910bd780e6efac35869@syzkaller.appspotmail.com ================================================================== BUG: KASAN: null-ptr-deref in soft_cursor+0x384/0x6b4 drivers/video/fbdev/core/softcursor.c:70 Read of size 16 at addr 0000000000000200 by task kworker/u4:1/12 CPU: 0 PID: 12 Comm: kworker/u4:1 Not tainted 6.4.0-rc3-syzkaller-geb0f1697d729 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/28/2023 Workqueue: events_power_efficient fb_flashcursor Call trace: dump_backtrace+0x1b8/0x1e4 arch/arm64/kernel/stacktrace.c:233 show_stack+0x2c/0x44 arch/arm64/kernel/stacktrace.c:240 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd0/0x124 lib/dump_stack.c:106 print_report+0xe4/0x514 mm/kasan/report.c:465 kasan_report+0xd4/0x130 mm/kasan/report.c:572 kasan_check_range+0x264/0x2a4 mm/kasan/generic.c:187 __asan_memcpy+0x3c/0x84 mm/kasan/shadow.c:105 soft_cursor+0x384/0x6b4 drivers/video/fbdev/core/softcursor.c:70 bit_cursor+0x113c/0x1a64 drivers/video/fbdev/core/bitblit.c:377 fb_flashcursor+0x35c/0x54c drivers/video/fbdev/core/fbcon.c:380 process_one_work+0x788/0x12d4 kernel/workqueue.c:2405 worker_thread+0x8e0/0xfe8 kernel/workqueue.c:2552 kthread+0x288/0x310 kernel/kthread.c:379 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:853 ================================================================== --- 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 bug is already fixed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to change bug's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the bug is a duplicate of another bug, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup