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([106.51.83.242]) by smtp.gmail.com with ESMTPSA id l12-20020a170903244c00b001c0bf60ba5csm2668777pls.272.2023.10.03.22.48.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Oct 2023 22:48:23 -0700 (PDT) From: "Ranbir Singh" To: devel@edk2.groups.io, rsingh@ventanamicro.com Cc: Hao A Wu , Ray Ni , Veeresh Sangolli Subject: [edk2-devel] [PATCH v1 1/2] MdeModulePkg/Bus/Usb/UsbMouseDxe: Fix REVERSE_INULL Coverity issue Date: Wed, 4 Oct 2023 11:18:17 +0530 Message-Id: <20231004054818.100353-2-rsingh@ventanamicro.com> In-Reply-To: <20231004054818.100353-1-rsingh@ventanamicro.com> References: <20231004054818.100353-1-rsingh@ventanamicro.com> MIME-Version: 1.0 Precedence: Bulk List-Subscribe: List-Help: Sender: devel@edk2.groups.io List-Id: Mailing-List: list devel@edk2.groups.io; contact devel+owner@edk2.groups.io Reply-To: devel@edk2.groups.io,rsingh@ventanamicro.com List-Unsubscribe-Post: List-Unsubscribe=One-Click List-Unsubscribe: Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @groups.io) X-ZM-MESSAGEID: 1696398508107100007 Content-Type: text/plain; charset="utf-8" From: Ranbir Singh The function USBMouseDriverBindingStart do have ASSERT (UsbMouseDevice !=3D NULL); after AllocateZeroPool, but it is applicable only in DEBUG mode. In RELEASE mode, if for whatever reasons UsbMouseDevice is NULL at this point, the code proceeds to dereference "UsbMouseDevice" afterwards which will lead to CRASH. Hence, for safety add NULL pointer checks always. REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3D4222 Cc: Hao A Wu Cc: Ray Ni Co-authored-by: Veeresh Sangolli Signed-off-by: Ranbir Singh Signed-off-by: Ranbir Singh --- MdeModulePkg/Bus/Usb/UsbMouseDxe/UsbMouse.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/MdeModulePkg/Bus/Usb/UsbMouseDxe/UsbMouse.c b/MdeModulePkg/Bus= /Usb/UsbMouseDxe/UsbMouse.c index 451d4b934f4c..621d09713b24 100644 --- a/MdeModulePkg/Bus/Usb/UsbMouseDxe/UsbMouse.c +++ b/MdeModulePkg/Bus/Usb/UsbMouseDxe/UsbMouse.c @@ -161,6 +161,10 @@ USBMouseDriverBindingStart ( =20 UsbMouseDevice =3D AllocateZeroPool (sizeof (USB_MOUSE_DEV)); ASSERT (UsbMouseDevice !=3D NULL); + if (UsbMouseDevice =3D=3D NULL) { + Status =3D EFI_OUT_OF_RESOURCES; + goto ErrorExit; + } =20 UsbMouseDevice->UsbIo =3D UsbIo; UsbMouseDevice->Signature =3D USB_MOUSE_DEV_SIGNATURE; --=20 2.34.1 -=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D-=3D- Groups.io Links: You receive all messages sent to this group. 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