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Ext4Pkg: Fix division by zero by adding check for s_inodes_per_group

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Superblock s_inodes_per_group field can't be zero, it leads to division
by zero in BlockGroup routine Ext4ReadInode

Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
This commit is contained in:
Savva Mitrofanov 2022-10-27 17:50:49 +06:00
parent 2d406aacfb
commit bc05eacaa3
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1 changed files with 5 additions and 0 deletions
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Ext4Pkg/Ext4Dxe/Superblock.c
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@ -243,6 +243,11 @@ Ext4OpenSuperblock (
DEBUG ((DEBUG_FS, "Read only = %u\n", Partition->ReadOnly));
if (Sb->s_inodes_per_group == 0) {
DEBUG ((DEBUG_ERROR, "[ext4] Inodes per group can not be zero\n"));
return EFI_VOLUME_CORRUPTED;
}
Partition->BlockSize = (UINT32)LShiftU64 (1024, Sb->s_log_block_size);
// The size of a block group can also be calculated as 8 * Partition->BlockSize