Missing EFI_OUT_OF_RESOURCES exit status on failed Ext4CreateDentry
leads to NULL-pointer dereference in Ext4GetFileInfo (passing NULL
buffer in Ext4ReadDir)
Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
We need to validate inode number to prevent possible null-pointer
dereference of directory parent in Ext4OpenDirent. Also checks that
inode number valid across opened partition before we read it in
Ext4ReadInode.
Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
Directory entry structure can contain name_len bigger than size of "."
or "..", that's why CompareMem in such cases leads to global buffer
overflow. So there are two problems. The first is that statement doesn't
check cases when name_len != 0 but > 2 and the second is that we passing
big Length to CompareMem routine.
The correct way here is to check that name_len <= 2 and check for
null-terminator presence
Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
We need to free buffer on return if BlockRemainder != 0. Also changed
return logic from function to use use common exit to prevent code
duplication.
Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
Adds a Pedro Falcato's UEFI EXT4 filesystem driver that implements the EFI_FILE_PROTOCOL and EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.
Signed-off-by: Savva Mitrofanov <savvamtr@gmail.com>
