> -----Original Message-----
> From: Ranbir Singh <rsi...@ventanamicro.com>
> Sent: Monday, July 17, 2023 7:39 PM
> To: devel@edk2.groups.io; rsi...@ventanamicro.com
> Cc: Wu, Hao A <hao.a...@intel.com>; Ni, Ray <ray...@intel.com>; Veeresh
> Sangolli <veeresh.sango...@dellteam.com>
> Subject: [PATCH v1 1/2] MdeModulePkg/Bus/Pci/UhciDxe: Fix BAD_SHIFT
> Coverity issue
>
> From: Ranbir Singh <ranbir.sin...@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...@intel.com>
> Cc: Ray Ni <ray...@intel.com>
> Co-authored-by: Veeresh Sangolli <veeresh.sango...@dellteam.com>
> Signed-off-by: Ranbir Singh <ranbir.sin...@dell.com>
> Signed-off-by: Ranbir Singh <rsi...@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;
Return 0 will cause further issues within UhciLinkQhToFrameList() &
UhciUnlinkQhFromFrameList() where the returned value is being used in the below
'for' statement:
for (Index = 0; Index < UHCI_FRAME_NUM; Index += Qh->Interval) {
My thought is to return 1 (i.e. 1 << 0) as if the minimum allowed value for
'Interval' (which is 1) is being passed into this UhciConvertPollRate function.
Best Regards,
Hao Wu
>
> + }
>
> +
>
> //
>
> // Find the index (1 based) of the highest non-zero bit
>
> //
>
> --
> 2.34.1
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