[edk2-devel] [PATCH v2 2/3] MdeModulePkg/PciBusDxe: Fix possible uninitialized use

[Sergei Dmitrouk]

If the function gets invalid value for the `ResizableBarOp` parameter
and asserts are disabled, `Bit` can be used uninitialized.

Cc: Jian J Wang <jian.j.wang at intel.com>
Cc: Hao A Wu <hao.a.wu at intel.com>
Cc: Ray Ni <ray.ni at intel.com>
Signed-off-by: Sergei Dmitrouk <sergei at posteo.net>
---

Notes:
    v2:
    - simplify if-statement to avoid unused branches

 MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c b/MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c
index 6bba28367165..4caac56f1dcd 100644
--- a/MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c
+++ b/MdeModulePkg/Bus/Pci/PciBusDxe/PciLib.c
@@ -1778,10 +1778,9 @@ PciProgramResizableBar (
 
     if (ResizableBarOp == PciResizableBarMax) {
       Bit = HighBitSet64(Capabilities);
-    } else if (ResizableBarOp == PciResizableBarMin) {
+    } else {
+      ASSERT (ResizableBarOp == PciResizableBarMin);
       Bit = LowBitSet64(Capabilities);
-    } else {
-      ASSERT ((ResizableBarOp == PciResizableBarMax) || (ResizableBarOp == PciResizableBarMin));
     }
 
     ASSERT (Bit >= 0);
-- 
2.17.6



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