From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out162-62-58-216.mail.qq.com (out162-62-58-216.mail.qq.com [162.62.58.216]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 19897125B2 for ; Tue, 16 Jan 2024 09:22:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=qq.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=qq.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=qq.com header.i=@qq.com header.b="GDvzY5ew" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=qq.com; s=s201512; t=1705396619; bh=lIy9wHh+g96JsNjrDnYthtgcgqnhJ+ghbboFhC4b3To=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=GDvzY5ewoL1j17KitP4H3tK8g2EywKVAr2IQkjbgVQGZUE6X9nZesquh2vLubtaXd lHAx33DgORPvanZ0fW57m41RyIy/Lh8jFU96z90dj6SrqrGbkK3dQeKYRqXcRPAfDc oLffTSYwNrkC/tthZ7+HTm6fM14Dd54AVwxZBmGg= Received: from pek-lxu-l1.wrs.com ([111.198.225.215]) by newxmesmtplogicsvrsza1-0.qq.com (NewEsmtp) with SMTP id 35E86CCF; Tue, 16 Jan 2024 17:13:30 +0800 X-QQ-mid: xmsmtpt1705396410tsyui8bbs Message-ID: X-QQ-XMAILINFO: NvH2zBBgt3uTqLDJ+oJttz4uiJ218HS117yUUOijsOcEdfAtEXrfmON6pnQFf2 hgqXiout9Fq0RRqgkq1zRMqtDmwEChyznopyzyMhizf0sxWr4WIyNeS6fABqIjZh3wqHODFlqkKn dlbv3gZyffNSEI75IJlYEiu3zJ2eNeX990/YlNEMcf+EF+eImZTKCHeox/anL7KI9pSZ0WYuoRoX zO+IkvIBkH+/NmtHsmMrHitu+gzWslPMWpSYLwXwpHpQjlGTWoIF1gjZS6k0uhFdsaXojL5cyhM0 nbE+/nH9fMN5isOZskjPoyoa8cpgQ76vu/pkm0+Io1BqK5PSRr4Yqj/OF6Yaf64ZFcMrZB4zCcUR hY1Igpq1vF4d9YnhLhfZyAoxQSEyEbxOPSkbo/fDZmYV52aodqyk8D0c6JAqdyH0FxWFw8pppccI 6x5U3ToOU4YxO33jrT2MJZh4eqcsllKI5OPkqgarXPSqvLnif8qvURkJUaB1TAEk1sMZFlCdYe/C QSYAeechqvDZsFHD04nkLf0BbhZdoyCmRdFdlFg4U/ZAmddtU8B8xw0er3DaLm0p2XWbFL9BA73z 9jxRXgKMFbtJdBodbBxSiJBl7DjKris0gMNNTfz3ps9sf4V8S0uY5jTdVuFDexapgRf9G6svdiSJ WkryBXrtMIPxhNH0ipq3yXLKUFcTuRc1joY0f+5gu94LzCd87f5FPo/A9mMy6epAr9JyucMRAsTy MtAlBq6ZJb1hYkkewqaEtjp4Ru96+xf8WRLcYM/ysr8f73lGql8lrYCD7OibWNdIS9FzoaveTK1q ZESCWPl5pBHy6iv5LwEoewNkQMrXP2OkHhWSkfblx9HXrzRf3mgSP9usfIGipjs+S9ccUzj9UdM/ PhtADsig80062YgrKSn1s1g7TQiGHVDE3UtKdZX0yiXctFIT86rkReIoCuoTGZXiDSFo0OsffFip crc3PiLPU= X-QQ-XMRINFO: M/715EihBoGSf6IYSX1iLFg= From: Edward Adam Davis To: syzbot+7ec955e36bb239bd720f@syzkaller.appspotmail.com Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [net?] KASAN: slab-out-of-bounds Read in dsa_user_prechangeupper Date: Tue, 16 Jan 2024 17:13:31 +0800 X-OQ-MSGID: <20240116091330.572860-2-eadavis@qq.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <00000000000002faa2060f02e766@google.com> References: <00000000000002faa2060f02e766@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit please test slab-out-of-bounds Read in dsa_user_prechangeupper #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 3e7aeb78ab01 diff --git a/net/dsa/user.c b/net/dsa/user.c index b738a466e2dc..e6bb2c527067 100644 --- a/net/dsa/user.c +++ b/net/dsa/user.c @@ -2865,7 +2865,8 @@ static int dsa_user_changeupper(struct net_device *dev, static int dsa_user_prechangeupper(struct net_device *dev, struct netdev_notifier_changeupper_info *info) { - struct dsa_port *dp = dsa_user_to_port(dev); + const struct rtnl_link_ops *ops = dev->rtnl_link_ops; + struct dsa_port *dp = ops->priv_size ? dsa_user_to_port(dev) : NULL; if (!dsa_user_dev_check(dev)) return NOTIFY_DONE;