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[efi] Add excessive sanity checks into efi_debug functions 

Try very hard to avoid ever doing something invalid while attempting
to generate a debug message.

Debugged-by: Curtis Larsen <larsen@dixie.edu>
Signed-off-by: Michael Brown <mcb30@ipxe.org>
pull/20/merge
Michael Brown 2014-08-01 00:03:39 +01:00
parent 89c8c7d4eb
commit f207176987
1 changed files with 53 additions and 3 deletions
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56
src/interface/efi/efi_debug.c
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@ -168,6 +168,10 @@ const char * efi_guid_ntoa ( EFI_GUID *guid ) {
} u;
unsigned int i;
/* Sanity check */
if ( ! guid )
return NULL;
/* Check for a match against well-known GUIDs */
for ( i = 0 ; i < ( sizeof ( efi_well_known_guids ) /
sizeof ( efi_well_known_guids[0] ) ) ; i++ ) {
@ -224,6 +228,13 @@ void dbg_efi_openers ( EFI_HANDLE handle, EFI_GUID *protocol ) {
EFI_STATUS efirc;
int rc;
/* Sanity check */
if ( ( ! handle ) || ( ! protocol ) ) {
printf ( "EFI could not retrieve openers for %s on %p\n",
efi_guid_ntoa ( protocol ), handle );
return;
}
/* Retrieve list of openers */
if ( ( efirc = bs->OpenProtocolInformation ( handle, protocol, &openers,
&count ) ) != 0 ) {
@ -268,6 +279,12 @@ void dbg_efi_protocols ( EFI_HANDLE handle ) {
EFI_STATUS efirc;
int rc;
/* Sanity check */
if ( ! handle ) {
printf ( "EFI could not retrieve protocols for %p\n", handle );
return;
}
/* Retrieve list of protocols */
if ( ( efirc = bs->ProtocolsPerHandle ( handle, &protocols,
&count ) ) != 0 ) {
@ -301,9 +318,17 @@ const char * efi_devpath_text ( EFI_DEVICE_PATH_PROTOCOL *path ) {
static char text[256];
CHAR16 *wtext;
/* Convert path to a textual representation */
if ( ! efidpt )
/* Sanity checks */
if ( ! efidpt ) {
DBG ( "[No DevicePathToText]" );
return NULL;
}
if ( ! path ) {
DBG ( "[NULL DevicePath]" );
return NULL;
}
/* Convert path to a textual representation */
wtext = efidpt->ConvertDevicePathToText ( path, TRUE, FALSE );
if ( ! wtext )
return NULL;
@ -328,6 +353,12 @@ static const char * efi_driver_name ( EFI_COMPONENT_NAME2_PROTOCOL *wtf ) {
CHAR16 *driver_name;
EFI_STATUS efirc;
/* Sanity check */
if ( ! wtf ) {
DBG ( "[NULL ComponentName2]" );
return NULL;
}
/* Try "en" first; if that fails then try the first language */
if ( ( ( efirc = wtf->GetDriverName ( wtf, "en",
&driver_name ) ) != 0 ) &&
@ -350,7 +381,7 @@ static const char * efi_driver_name ( EFI_COMPONENT_NAME2_PROTOCOL *wtf ) {
static const char *
efi_pecoff_debug_name ( EFI_LOADED_IMAGE_PROTOCOL *loaded ) {
static char buf[32];
EFI_IMAGE_DOS_HEADER *dos = loaded->ImageBase;
EFI_IMAGE_DOS_HEADER *dos;
EFI_IMAGE_OPTIONAL_HEADER_UNION *pe;
EFI_IMAGE_OPTIONAL_HEADER32 *opt32;
EFI_IMAGE_OPTIONAL_HEADER64 *opt64;
@ -367,7 +398,14 @@ efi_pecoff_debug_name ( EFI_LOADED_IMAGE_PROTOCOL *loaded ) {
char *name;
char *tmp;
/* Sanity check */
if ( ! loaded ) {
DBG ( "[NULL LoadedImage]" );
return NULL;
}
/* Parse DOS header */
dos = loaded->ImageBase;
if ( ! dos ) {
DBG ( "[Missing DOS header]" );
return NULL;
@ -462,6 +500,12 @@ efi_pecoff_debug_name ( EFI_LOADED_IMAGE_PROTOCOL *loaded ) {
static const char *
efi_first_loaded_image_name ( EFI_LOADED_IMAGE_PROTOCOL *loaded ) {
/* Sanity check */
if ( ! loaded ) {
DBG ( "[NULL LoadedImage]" );
return NULL;
}
return ( ( loaded->ParentHandle == NULL ) ? "DxeCore(?)" : NULL );
}
@ -474,6 +518,12 @@ efi_first_loaded_image_name ( EFI_LOADED_IMAGE_PROTOCOL *loaded ) {
static const char *
efi_loaded_image_filepath_name ( EFI_LOADED_IMAGE_PROTOCOL *loaded ) {
/* Sanity check */
if ( ! loaded ) {
DBG ( "[NULL LoadedImage]" );
return NULL;
}
return efi_devpath_text ( loaded->FilePath );
}