audk/MdeModulePkg/Universal/Disk/UdfDxe
Paulo Alcantara 11b4463e09 MdeModulePkg/UdfDxe: Fix NULL pointer dereference
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=704

For root directory, the FID (File Identifier Descriptor) pointer is
accessible through PRIVATE_UDF_FILE_DATA.Root, whereas non-root
directory and regular files, their FIDs are accessible through
PRIVATE_UDF_FILE_DATA.File.

In UdfSetPosition(), the FID was retrieved through
PRIVATE_UDF_FILE_DATA.File, hence when calling it with a root directory,
PRIVATE_UDF_FILE_DATA.File.FileIdentifierDescriptor would be NULL and
then dereferenced.

This patch fixes the NULL pointer dereference by calling _FILE() to
transparently return the correct UDF_FILE_INFO * which points to a valid
FID descriptor of a specific file.

Cc: Star Zeng <star.zeng@intel.com>
Cc: Eric Dong <eric.dong@intel.com>
Cc: Ruiyu Ni <ruiyu.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Steven Shi <steven.shi@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Reported-by: Steven Shi <steven.shi@intel.com>
Signed-off-by: Paulo Alcantara <pcacjr@zytor.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Star Zeng <star.zeng@intel.com>
2017-09-15 09:38:05 +08:00
..
ComponentName.c MdeModulePkg: Initial UDF/ECMA-167 file system support 2017-09-08 20:42:49 +02:00
File.c MdeModulePkg/UdfDxe: Fix NULL pointer dereference 2017-09-15 09:38:05 +08:00
FileName.c MdeModulePkg: Initial UDF/ECMA-167 file system support 2017-09-08 20:42:49 +02:00
FileSystemOperations.c MdeModulePkg UdfDxe: Fix VS2010/VS2012 build failure 2017-09-15 09:26:24 +08:00
Udf.c MdeModulePkg: Initial UDF/ECMA-167 file system support 2017-09-08 20:42:49 +02:00
Udf.h MdeModulePkg: Initial UDF/ECMA-167 file system support 2017-09-08 20:42:49 +02:00
UdfDxe.inf MdeModulePkg: Initial UDF/ECMA-167 file system support 2017-09-08 20:42:49 +02:00