[edk2-devel] [PATCH v1 1/2] MdeModulePkg/Bus/Pci/UhciDxe: Fix BAD_SHIFT Coverity issue

[Ranbir Singh]

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

The function UhciConvertPollRate has a check

    ASSERT (Interval != 0);

but this comes into play only in DEBUG mode. In Release mode, there is
no handling if the Interval parameter value is ZERO. To avoid shifting
by a negative amount later in the code flow in this undesirable case,
it is better to handle it as well by simply returning ZERO.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4211

Cc: Hao A Wu <hao.a.wu at intel.com>
Cc: Ray Ni <ray.ni at intel.com>
Co-authored-by: Veeresh Sangolli <veeresh.sangolli at dellteam.com>
Signed-off-by: Ranbir Singh <Ranbir.Singh3 at Dell.com>
Signed-off-by: Ranbir Singh <rsingh at ventanamicro.com>
---
 MdeModulePkg/Bus/Pci/UhciDxe/UhciSched.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/MdeModulePkg/Bus/Pci/UhciDxe/UhciSched.c b/MdeModulePkg/Bus/Pci/UhciDxe/UhciSched.c
index c08f9496969b..8ddef4b68ccf 100644
--- a/MdeModulePkg/Bus/Pci/UhciDxe/UhciSched.c
+++ b/MdeModulePkg/Bus/Pci/UhciDxe/UhciSched.c
@@ -214,6 +214,10 @@ UhciConvertPollRate (
 
   ASSERT (Interval != 0);
 
+  if (Interval == 0) {
+    return 0;
+  }
+
   //
   // Find the index (1 based) of the highest non-zero bit
   //
-- 
2.34.1



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