[edk2-platforms][PATCH 10/10] Ext4Pkg: Group descriptor size must be 4-byte aligned

["Savva Mitrofanov" <savvamtr@gmail.com>]

Adds 4-byte aligned check for superblock group descriptor size field

Cc: Marvin Häuser <mhaeuser@posteo.de>
Cc: Pedro Falcato <pedro.falcato@gmail.com>
Cc: Vitaly Cheptsov <vit9696@protonmail.com>
Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
---
 Features/Ext4Pkg/Ext4Dxe/Directory.c  |  2 +-
 Features/Ext4Pkg/Ext4Dxe/Superblock.c | 10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/Features/Ext4Pkg/Ext4Dxe/Directory.c b/Features/Ext4Pkg/Ext4Dxe/Directory.c
index d1038c04926e..4441e6d192b6 100644
--- a/Features/Ext4Pkg/Ext4Dxe/Directory.c
+++ b/Features/Ext4Pkg/Ext4Dxe/Directory.c
@@ -74,7 +74,7 @@ Ext4ValidDirent (
   }
 
   // Dirent sizes need to be 4 byte aligned
-  if (Dirent->rec_len % 4) {
+  if ((Dirent->rec_len % 4) != 0) {
     return FALSE;
   }
 
diff --git a/Features/Ext4Pkg/Ext4Dxe/Superblock.c b/Features/Ext4Pkg/Ext4Dxe/Superblock.c
index 42762b6aa780..3bf2e3001f26 100644
--- a/Features/Ext4Pkg/Ext4Dxe/Superblock.c
+++ b/Features/Ext4Pkg/Ext4Dxe/Superblock.c
@@ -257,16 +257,16 @@ Ext4OpenSuperblock (
     ));
 
   if (EXT4_IS_64_BIT (Partition)) {
+    // s_desc_size should be 4 byte aligned and
+    // 64 bit filesystems need DescSize to be 64 bytes
+    if (((Sb->s_desc_size % 4) != 0) || (Sb->s_desc_size < EXT4_64BIT_BLOCK_DESC_SIZE)) {
+      return EFI_VOLUME_CORRUPTED;
+    }
     Partition->DescSize = Sb->s_desc_size;
   } else {
     Partition->DescSize = EXT4_OLD_BLOCK_DESC_SIZE;
   }
 
-  if ((Partition->DescSize < EXT4_64BIT_BLOCK_DESC_SIZE) && EXT4_IS_64_BIT (Partition)) {
-    // 64 bit filesystems need DescSize to be 64 bytes
-    return EFI_VOLUME_CORRUPTED;
-  }
-
   if (!Ext4VerifySuperblockChecksum (Partition, Sb)) {
     DEBUG ((DEBUG_ERROR, "[ext4] Bad superblock checksum %lx\n", Ext4CalculateSuperblockChecksum (Partition, Sb)));
     return EFI_VOLUME_CORRUPTED;
-- 
2.37.0