Adds 4-byte aligned check for superblock group descriptor size field
Cc: Marvin Häuser <mhaeu...@posteo.de>
Cc: Pedro Falcato <pedro.falc...@gmail.com>
Cc: Vitaly Cheptsov <vit9...@protonmail.com>
Signed-off-by: Savva Mitrofanov <savva...@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
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