[edk2-devel] [PATCH v2 4/7] ArmPkg/DefaultExceptionHandlerLib: Check DebugImageInfoTable type safely
Ard Biesheuvel
ardb at kernel.org
Mon Aug 9 11:55:42 UTC 2021
On Mon, 9 Aug 2021 at 11:51, Marvin Häuser <mhaeuser at posteo.de> wrote:
>
> C does not allow casting to or dereferencing incompatible pointer
> types. Use the ImageInfoType member of the union first to determine
> the data type before dereferencing NormalImage.
>
> Cc: Leif Lindholm <leif at nuviainc.com>
> Cc: Ard Biesheuvel <ardb+tianocore at kernel.org>
> Cc: Vitaly Cheptsov <vit9696 at protonmail.com>
> Signed-off-by: Marvin Häuser <mhaeuser at posteo.de>
Hi Marvin,
Could you please organize your patches into a consistent series,
include a cover letter and cc me on everything?
I am going to disregard anything you sent yesterday and today, as it
is a bit of a jumble.
Thanks,
Ard.
> ---
> ArmPkg/Library/DefaultExceptionHandlerLib/DefaultExceptionHandlerUefi.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/ArmPkg/Library/DefaultExceptionHandlerLib/DefaultExceptionHandlerUefi.c b/ArmPkg/Library/DefaultExceptionHandlerLib/DefaultExceptionHandlerUefi.c
> index e9fea4038252..9befb6d4db9b 100644
> --- a/ArmPkg/Library/DefaultExceptionHandlerLib/DefaultExceptionHandlerUefi.c
> +++ b/ArmPkg/Library/DefaultExceptionHandlerLib/DefaultExceptionHandlerUefi.c
> @@ -51,8 +51,8 @@ GetImageName (
>
> Address = (CHAR8 *)(UINTN)FaultAddress;
> for (Entry = 0; Entry < DebugTableHeader->TableSize; Entry++, DebugTable++) {
> - if (DebugTable->NormalImage != NULL) {
> - if ((DebugTable->NormalImage->ImageInfoType == EFI_DEBUG_IMAGE_INFO_TYPE_NORMAL) &&
> + if (DebugTable->ImageInfoType != NULL) {
> + if ((*DebugTable->ImageInfoType == EFI_DEBUG_IMAGE_INFO_TYPE_NORMAL) &&
> (DebugTable->NormalImage->LoadedImageProtocolInstance != NULL)) {
> if ((Address >= (CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase) &&
> (Address <= ((CHAR8 *)DebugTable->NormalImage->LoadedImageProtocolInstance->ImageBase + DebugTable->NormalImage->LoadedImageProtocolInstance->ImageSize))) {
> --
> 2.31.1
>
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