SCUMM: Ensure pointer returned by getResourceAddress() is usable

In some cases the pointer returned is used directly without further
error checking.
As most instances already assert() in this case this commit simply
adds asserts where missing and deemed appropriate.

2 files changed, 4 insertions, 0 deletions

diff --git a/engines/scumm/players/player_ad.cpp b/engines/scumm/players/player_ad.cpp
index 7f0f449a92..40f4ec93c9 100644
--- a/engines/scumm/players/player_ad.cpp
+++ b/engines/scumm/players/player_ad.cpp
@@ -97,6 +97,7 @@ void Player_AD::startSound(int sound) {
 
 	// Query the sound resource
 	const byte *res = _vm->getResourceAddress(rtSound, sound);
+	assert(res);
 
 	if (res[2] == 0x80) {
 		// Stop the current sounds
diff --git a/engines/scumm/players/player_towns.cpp b/engines/scumm/players/player_towns.cpp
index 16080205c0..a1add906bb 100644
--- a/engines/scumm/players/player_towns.cpp
+++ b/engines/scumm/players/player_towns.cpp
@@ -236,6 +236,8 @@ void Player_Towns_v1::setMusicVolume(int vol) {
 
 void Player_Towns_v1::startSound(int sound) {
 	uint8 *ptr = _vm->getResourceAddress(rtSound, sound);
+	assert(ptr);
+
 	if (_vm->_game.version != 3)
 		ptr += 2;
 
@@ -620,6 +622,7 @@ int Player_Towns_v2::getSoundStatus(int sound) const {
 
 void Player_Towns_v2::startSound(int sound) {
 	uint8 *ptr = _vm->getResourceAddress(rtSound, sound);
+	assert(ptr);
 
 	if (READ_BE_UINT32(ptr) == MKTAG('T','O','W','S')) {
 		_soundOverride[sound].type = 7;