Re: [edk2-devel] [edk2 Patch 1/1] EmbeddedPkg: compiler error due to arithmetic operation on void pointer

["Laszlo Ersek" <lersek@redhat.com>]

On 2/6/24 13:57, Ard Biesheuvel wrote:
> On Tue, 6 Feb 2024 at 05:23, Jayaprakash, N <n.jayaprakash@intel.com> wrote:
>>
>> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4668
>>
>> This commit fixes the issue reported in the BZ4668.
>> The EmbeddedPkg fails to compile with a compiler error
>> generated due to invalid/illegal arithmetic operation
>> on void pointers. It has been fixed by using explicit
>> type conversion of the void pointer to UINTN.
>>
>> Cc: Rebecca Cran <rebecca@bsdio.com>
>> Cc: Michael D Kinney <michael.d.kinney@intel.com>
>> Cc: Laszlo Ersek <lersek@redhat.com>
>> Cc: Leif Lindholm <quic_llindhol@quicinc.com>
>> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
>> Cc: Abner Chang <abner.chang@amd.com>
>> Cc: Jayaprakash N <n.jayaprakash@intel.com>
>> Signed-off-by: Jayaprakash N <n.jayaprakash@intel.com>
>> ---
>>  .../Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c      | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c b/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c
>> index fa81cc9d59..11566cf57f 100644
>> --- a/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c
>> +++ b/EmbeddedPkg/Library/PrePiMemoryAllocationLib/MemoryAllocationLib.c
>> @@ -308,7 +308,7 @@ ReallocatePool (
>>    if (OldBuffer != NULL) {
>>      HandOffHob = GetHobList ();
>>      ASSERT (((EFI_PHYSICAL_ADDRESS)(UINTN)OldBuffer >= HandOffHob->EfiMemoryBottom));
>> -    ASSERT (((EFI_PHYSICAL_ADDRESS)(UINTN)(OldBuffer + OldSize) <= HandOffHob->EfiFreeMemoryBottom));
>> +    ASSERT (((EFI_PHYSICAL_ADDRESS)(UINTN)((UINTN)OldBuffer + OldSize) <= HandOffHob->EfiFreeMemoryBottom));
> 
> 
> Do we really need two UINTN casts here?
> 

No, that should not be necessary. In
<https://edk2.groups.io/g/devel/message/115050> (msgid
<01296486-5b14-4b73-b9dc-777a723548cf@redhat.com>), I recommended:

--------------
We should replace (UINTN)(OldBuffer + OldSize) with ((UINTN)OldBuffer +
OldSize).
--------------

Note that the text to remove includes the original (UINTN) cast.

Laszlo



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