[edk2-devel] [PATCH v2 1/2] MdeModulePkg/Bus/Usb/UsbMouseDxe: Fix REVERSE_INULL Coverity issue

["Ranbir Singh" <rsingh@ventanamicro.com>]

From: Ranbir Singh <Ranbir.Singh3@Dell.com>

The function USBMouseDriverBindingStart do have

    ASSERT (UsbMouseDevice != 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=4222

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Co-authored-by: Veeresh Sangolli <veeresh.sangolli@dellteam.com>
Signed-off-by: Ranbir Singh <Ranbir.Singh3@Dell.com>
Signed-off-by: Ranbir Singh <rsingh@ventanamicro.com>
---
 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 (
 
   UsbMouseDevice = AllocateZeroPool (sizeof (USB_MOUSE_DEV));
   ASSERT (UsbMouseDevice != NULL);
+  if (UsbMouseDevice == NULL) {
+    Status = EFI_OUT_OF_RESOURCES;
+    goto ErrorExit;
+  }
 
   UsbMouseDevice->UsbIo     = UsbIo;
   UsbMouseDevice->Signature = USB_MOUSE_DEV_SIGNATURE;
-- 
2.34.1



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