Change in edk2[coreboot-stable202108]: BmpSupportLib: fix BMP validation

[Matt DeVillier (Code Review)]

Matt DeVillier has uploaded this change for review. ( https://review.coreboot.org/c/edk2/+/58785 )

Change subject: BmpSupportLib: fix BMP validation
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BmpSupportLib: fix BMP validation

BMP files by tools other than MS paint can have a
variable number of padding bytes, which results in
the DataSize being less than (ImageSize - HeaderSize).
Fix the check to be less stringent.

Test: use BMP created by/saved by Photoshop

Signed-off-by: Matt DeVillier 
Change-Id: I97d2e90aef7043a28b3bdda2eab52cb19e086930
---
M MdeModulePkg/Library/BaseBmpSupportLib/BmpSupportLib.c
1 file changed, 1 insertion(+), 1 deletion(-)

git pull ssh://review.coreboot.org:29418/edk2 refs/changes/85/58785/1

diff --git a/MdeModulePkg/Library/BaseBmpSupportLib/BmpSupportLib.c b/MdeModulePkg/Library/BaseBmpSupportLib/BmpSupportLib.c
index 3ac31f6..944d01f 100644
--- a/MdeModulePkg/Library/BaseBmpSupportLib/BmpSupportLib.c
+++ b/MdeModulePkg/Library/BaseBmpSupportLib/BmpSupportLib.c
@@ -213,7 +213,7 @@

if ((BmpHeader->Size != BmpImageSize) ||
       (BmpHeader->Size < BmpHeader->ImageOffset) ||
-      (BmpHeader->Size - BmpHeader->ImageOffset != DataSize)) {
+      (BmpHeader->Size - BmpHeader->ImageOffset < DataSize)) {

DEBUG ((DEBUG_ERROR, "TranslateBmpToGopBlt: invalid BmpImage... \n"));
     DEBUG ((DEBUG_ERROR, "   BmpHeader->Size: 0x%x\n", BmpHeader->Size));