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MdeModulePkg/Bus/Pci/UhciDxe: Fix BAD_SHIFT Coverity issue

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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 treating it same as if 1 is sent.

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

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>
Reviewed-by: Hao A Wu <hao.a.wu@intel.com>
This commit is contained in:
Ranbir Singh 2023-08-16 13:38:02 +08:00 committed by mergify[bot]
parent f67e1934d9
commit e9f5d8c0e0
1 changed files with 9 additions and 1 deletions
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10
MdeModulePkg/Bus/Pci/UhciDxe/UhciSched.c
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@ -197,7 +197,7 @@ UhciDestoryFrameList (
}
/**
Convert the poll rate to the maxium 2^n that is smaller
Convert the poll rate to the maximum 2^n that is smaller
than Interval.
@param Interval The poll rate to convert.
@ -214,6 +214,14 @@ UhciConvertPollRate (
ASSERT (Interval != 0);
//
// To safeguard RELEASE mode wherein ASSERT is effectively not there,
// if inadvertently Interval is still 0 here, treat it the same as 1.
//
if (Interval == 0) {
Interval = 1;
}
//
// Find the index (1 based) of the highest non-zero bit
//