[PATCH 1/1] ShellPkgDisconnect: zero-initialize handles

["Gerd Hoffmann" <kraxel@redhat.com>]

In case ShellConvertStringToUint64() fails the Handles are left
uninitialized.  That can for example happen for Handle2 and Handle3 in
case only one parameter was specified on the command line.  Which can
trigger the ASSERT() in line 185.

Reproducer: boot ovmf to efi shell in qemu, using q35 machine type, then
try disconnect the sata controller in efi shell.

Fix that by explicitly setting them to NULL in that case.  While being
at it also simplify the logic and avoid pointlessly calling
ShellConvertStringToUint64() in case ParamN is NULL.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 .../UefiShellDriver1CommandsLib/Disconnect.c  | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/ShellPkg/Library/UefiShellDriver1CommandsLib/Disconnect.c b/ShellPkg/Library/UefiShellDriver1CommandsLib/Disconnect.c
index fd49d1f7ceb4..fac6463e3c28 100644
--- a/ShellPkg/Library/UefiShellDriver1CommandsLib/Disconnect.c
+++ b/ShellPkg/Library/UefiShellDriver1CommandsLib/Disconnect.c
@@ -160,16 +160,23 @@ ShellCommandRunDisconnect (
         Param1 = ShellCommandLineGetRawValue (Package, 1);
         Param2 = ShellCommandLineGetRawValue (Package, 2);
         Param3 = ShellCommandLineGetRawValue (Package, 3);
-        if (!EFI_ERROR (ShellConvertStringToUint64 (Param1, &Intermediate1, TRUE, FALSE))) {
-          Handle1 = Param1 != NULL ? ConvertHandleIndexToHandle ((UINTN)Intermediate1) : NULL;
+
+        if (Param1 && !EFI_ERROR (ShellConvertStringToUint64 (Param1, &Intermediate1, TRUE, FALSE))) {
+          Handle1 = ConvertHandleIndexToHandle ((UINTN)Intermediate1);
+        } else {
+          Handle1 = NULL;
         }
 
-        if (!EFI_ERROR (ShellConvertStringToUint64 (Param2, &Intermediate2, TRUE, FALSE))) {
-          Handle2 = Param2 != NULL ? ConvertHandleIndexToHandle ((UINTN)Intermediate2) : NULL;
+        if (Param2 && !EFI_ERROR (ShellConvertStringToUint64 (Param2, &Intermediate2, TRUE, FALSE))) {
+          Handle2 = ConvertHandleIndexToHandle ((UINTN)Intermediate2);
+        } else {
+          Handle2 = NULL;
         }
 
-        if (!EFI_ERROR (ShellConvertStringToUint64 (Param3, &Intermediate3, TRUE, FALSE))) {
-          Handle3 = Param3 != NULL ? ConvertHandleIndexToHandle ((UINTN)Intermediate3) : NULL;
+        if (Param3 && !EFI_ERROR (ShellConvertStringToUint64 (Param3, &Intermediate3, TRUE, FALSE))) {
+          Handle3 = ConvertHandleIndexToHandle ((UINTN)Intermediate3);
+        } else {
+          Handle3 = NULL;
         }
 
         if ((Param1 != NULL) && (Handle1 == NULL)) {
-- 
2.40.0