KYRA: (EOB) - fix possible out of bounds mem access

(This can't happen through normal gameplay, but still better to be fixed)

2 files changed, 27 insertions, 21 deletions

diff --git a/engines/kyra/graphics/screen_eob.cpp b/engines/kyra/graphics/screen_eob.cpp
index 90e2d1f41f..4cd471ee0a 100644
--- a/engines/kyra/graphics/screen_eob.cpp
+++ b/engines/kyra/graphics/screen_eob.cpp
@@ -1755,7 +1755,7 @@ bool OldDOSFont::load(Common::SeekableReadStream &file) {
 
 	_width = _data[0x103];
 	_height = _data[0x102];
-	_numGlyphs = 255;
+	_numGlyphs = (READ_LE_UINT16(_data + 2) / 2) - 2;
 
 	_bitmapOffsets = (uint16 *)(_data + 2);
 
@@ -1766,8 +1766,10 @@ bool OldDOSFont::load(Common::SeekableReadStream &file) {
 }
 
 int OldDOSFont::getCharWidth(uint16 c) const {
-	if (c >= _numGlyphs)
-		return 0;
+	// Since these fonts have a fixed character width we always give a return value
+	// even if there is no glyph for the specified character (which can't normally
+	// happen anyway - you'd have to do something like importing a Japanese save file
+	// into the English version).
 	return _width;
 }
 
@@ -1822,6 +1824,9 @@ void OldDOSFont::drawChar(uint16 c, byte *dst, int pitch, int bpp) const {
 		}
 	}
 
+	if (c >= _numGlyphs)
+		return;
+
 	pitch *= bpp;
 	const uint8 *src = &_data[_bitmapOffsets[c]];
 	uint8 *dst2 = dst + pitch;
diff --git a/engines/kyra/gui/gui_eob.cpp b/engines/kyra/gui/gui_eob.cpp
index 2b16e7621f..1babce7267 100644
--- a/engines/kyra/gui/gui_eob.cpp
+++ b/engines/kyra/gui/gui_eob.cpp
@@ -2536,6 +2536,7 @@ int GUI_EoB::getTextInput(char *dest, int x, int y, int destMaxLen, int textColo
 	_menuCur = -1;
 	printKatakanaOptions(0);
 
+	int bytesPerChar = (_vm->_flags.lang == Common::JA_JPN) ? 2 : 1;
 	int in = 0;
 
 	do {
@@ -2586,9 +2587,9 @@ int GUI_EoB::getTextInput(char *dest, int x, int y, int destMaxLen, int textColo
 		if (_keyPressed.keycode == Common::KEYCODE_BACKSPACE) {
 			if (pos > 0 && pos < len ) {
 				for (int i = pos; i < len; i++) {
-					if (dest[i * 2] & 0x80) {
-						dest[(i - 1) * 2] = dest[i * 2];
-						dest[(i - 1) * 2 + 1] = dest[i * 2 + 1];
+					if (bytesPerChar == 2 && dest[i * bytesPerChar] & 0x80) {
+						dest[(i - 1) * bytesPerChar] = dest[i * bytesPerChar];
+						dest[(i - 1) * bytesPerChar + 1] = dest[i * bytesPerChar + 1];
 					} else {
 						dest[i - 1] = dest[i];
 					}
@@ -2596,8 +2597,8 @@ int GUI_EoB::getTextInput(char *dest, int x, int y, int destMaxLen, int textColo
 			}
 
 			if (pos > 0) {
-				if (dest[(len - 1) * 2] & 0x80)
-					dest[--len * 2] = 0;
+				if (bytesPerChar == 2 && dest[(len - 1) * bytesPerChar] & 0x80)
+					dest[--len * bytesPerChar] = 0;
 				else
 					dest[--len] = 0;
 				pos--;
@@ -2618,19 +2619,19 @@ int GUI_EoB::getTextInput(char *dest, int x, int y, int destMaxLen, int textColo
 
 				if (pos < len) {
 					for (int i = destMaxLen - 2; i >= pos; i--) {
-						if (in == 0x89) {
-							dest[(i + 1) * 2] = dest[i * 2];
-							dest[(i + 1) * 2 + 1] = dest[i * 2 + 1];
+						if (bytesPerChar == 2 && in == 0x89) {
+							dest[(i + 1) * bytesPerChar] = dest[i * bytesPerChar];
+							dest[(i + 1) * bytesPerChar + 1] = dest[i * bytesPerChar + 1];
 						} else {
 							dest[i + 1] = dest[i];
 						}
 					}
 
-					if (in == 0x89) {
-						dest[pos * 2] = _csjis[0];
-						dest[pos++ * 2 + 1] = _csjis[1];
+					if (bytesPerChar == 2 && in == 0x89) {
+						dest[pos * bytesPerChar] = _csjis[0];
+						dest[pos++ * bytesPerChar + 1] = _csjis[1];
 						if (len == destMaxLen)
-							dest[len * 2] = 0;
+							dest[len * bytesPerChar] = 0;
 					} else {
 						dest[pos++] = in;
 						if (len == destMaxLen)
@@ -2642,10 +2643,10 @@ int GUI_EoB::getTextInput(char *dest, int x, int y, int destMaxLen, int textColo
 						len--;
 					}
 
-					if (in == 0x89) {
-						dest[pos * 2] = _csjis[0];
-						dest[pos * 2 + 1] = _csjis[1];
-						dest[++pos * 2] = 0;
+					if (bytesPerChar == 2 && in == 0x89) {
+						dest[pos * bytesPerChar] = _csjis[0];
+						dest[pos * bytesPerChar + 1] = _csjis[1];
+						dest[++pos * bytesPerChar] = 0;
 					} else {
 						dest[pos++] = in;
 						dest[pos] = 0;
@@ -2665,8 +2666,8 @@ int GUI_EoB::getTextInput(char *dest, int x, int y, int destMaxLen, int textColo
 		
 		if (_vm->_flags.platform == Common::kPlatformFMTowns) {
 			if (pos < len) {
-				sufx[0] = dest[pos * 2];
-				sufx[1] = dest[pos * 2 + 1];
+				sufx[0] = dest[pos * bytesPerChar];
+				sufx[1] = dest[pos * bytesPerChar + 1];
 			} else {
 				sufx[0] = 32;
 				sufx[1] = 0;