From nobody Sat Nov 30 05:29:20 2024 Received: from m16.mail.163.com (m16.mail.163.com [220.197.31.2]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 49DB9185952; Wed, 11 Sep 2024 12:52:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=220.197.31.2 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726059125; cv=none; b=PKfVJXgkA6qdfWTK/BGZe6hJDGdfIKDgkWz54A/z7+Xhv8zjaJ7qSIHUBmpg11nyIILyfrj386fm1de5vmLv3tFzW2RzDWahg2yCRz0R/+NDV6bJ7Go00GI8IPoKJh2gqP0DeMSVIBJql7WVPofJFhZkeru2kpe9n+lyIoWpJqk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1726059125; c=relaxed/simple; bh=DkDNO3+/HIOPzfQfkH3CefAUuCsde3qx72N7MjZkUos=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=Mi8ALwoZ6uTLikyzZtdGJCn4BurIIpX1b1tEC3LaTrRKlFY6HnckyF2P4NeaV3TgGhUh0qT5nOit7jFXP7QGtOry4mH+SO321Hum5XBLP6Q5Jw0Xv2V/gh3fudjwWkHXqJhC7aYsv5TWSBnfHGLfsydhvzvipagUR86QsXyFbAI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com; spf=pass smtp.mailfrom=163.com; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b=aobxcyoE; arc=none smtp.client-ip=220.197.31.2 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=163.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=163.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="aobxcyoE" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=dOBwp HSygVUV5YR0zc6cjxhI4d8cJqeLkkmOcsSF9hU=; b=aobxcyoEja7ZvOMNrgVh9 +6mRpcoe+yUnPgd4xvQ0uTmt8LQrMko0hUrXnsw5ep4LV21u09EHDGPJgljph1GN GrLwBHiF0i97NbA74P5PPrmqlJ0N6w4LH3ZBC46R0caLoe1OxhChJlb4Itkf8YS6 IHlf2NCzD1+Zzw0ohjykXk= Received: from iZbp1asjb3cy8ks0srf007Z.. (unknown [120.26.85.94]) by gzsmtp4 (Coremail) with SMTP id sygvCgDXHndNkuFmmfouBg--.3491S2; Wed, 11 Sep 2024 20:51:26 +0800 (CST) From: Qianqiang Liu To: hongxing.zhu@nxp.com, l.stach@pengutronix.de, shawnguo@kernel.org, s.hauer@pengutronix.de Cc: linux-pci@vger.kernel.org, imx@lists.linux.dev, linux-kernel@vger.kernel.org, Qianqiang Liu Subject: [PATCH] PCI: imx6: Fix a "Null pointer dereference" issue Date: Wed, 11 Sep 2024 20:50:57 +0800 Message-Id: <20240911125055.58555-1-qianqiang.liu@163.com> X-Mailer: git-send-email 2.39.2 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-CM-TRANSID: sygvCgDXHndNkuFmmfouBg--.3491S2 X-Coremail-Antispam: 1Uf129KBjvdXoWrKr4rWrWkAw4fZry3ArWfGrg_yoWkJrgE93 4j9FsrCr4UGryrC3sFy3y3AFWav3Z3Zw18Wa4FqFZxZFnIqw15ArnrXF9xtFW8GrsxXF9x CryDAF45CryUujkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7xRRxR6PUUUUU== X-CM-SenderInfo: xtld01pldqwhxolxqiywtou0bp/1tbiRQ5XamXAo2QY8AAAs8 Content-Type: text/plain; charset="utf-8" The "resource_list_first_type" function may return NULL, which will make "entry->offset" dereferences a NULL pointer. Signed-off-by: Qianqiang Liu --- drivers/pci/controller/dwc/pci-imx6.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller= /dwc/pci-imx6.c index 0dbc333adcff..04e90ba4e7d6 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -1017,13 +1017,14 @@ static u64 imx_pcie_cpu_addr_fixup(struct dw_pcie *= pcie, u64 cpu_addr) struct imx_pcie *imx_pcie =3D to_imx_pcie(pcie); struct dw_pcie_rp *pp =3D &pcie->pp; struct resource_entry *entry; - unsigned int offset; + unsigned int offset =3D 0; =20 if (!(imx_pcie->drvdata->flags & IMX_PCIE_FLAG_CPU_ADDR_FIXUP)) return cpu_addr; =20 entry =3D resource_list_first_type(&pp->bridge->windows, IORESOURCE_MEM); - offset =3D entry->offset; + if (entry) + offset =3D entry->offset; =20 return (cpu_addr - offset); } --=20 2.39.2