File CVE-2019-7572.patch of Package SDL.23722

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File CVE-2019-7572.patch of Package SDL.23722

diff --git a/src/audio/SDL_wave.c b/src/audio/SDL_wave.c
index 2968b3d..caf41ee 100644
--- a/src/audio/SDL_wave.c
+++ b/src/audio/SDL_wave.c
@@ -275,6 +275,13 @@ static Sint32 IMA_ADPCM_nibble(struct IMA_ADPCM_decodestate *state,Uint8 nybble)
 	};
 	Sint32 delta, step;
 
+	if ( state->index > 88 ) {
+		state->index = 88;
+	} else
+	if ( state->index < 0 ) {
+		state->index = 0;
+	}
+
 	/* Compute difference and new sample value */
 	step = step_table[state->index];
 	delta = step >> 3;
@@ -334,7 +341,7 @@ static void Fill_IMA_ADPCM_block(Uint8 *decoded, Uint8 *encoded,
 static int IMA_ADPCM_decode(Uint8 **audio_buf, Uint32 *audio_len)
 {
 	struct IMA_ADPCM_decodestate *state;
-	Uint8 *freeable, *encoded, *encoded_end, *decoded;
+	Uint8 *freeable, *encoded, *encoded_end, *decoded, *decoded_end;
 	Sint32 encoded_len, samplesleft;
 	unsigned int c, channels;
 
@@ -361,7 +368,7 @@ static int IMA_ADPCM_decode(Uint8 **audio_buf, Uint32 *audio_len)
 		return(-1);
 	}
 	decoded = *audio_buf;
-
+	decoded_end = decoded + *audio_len;
 	/* Get ready... Go! */
 	while ( encoded_len >= IMA_ADPCM_state.wavefmt.blockalign ) {
 		/* Grab the initial information for this block */
@@ -380,6 +387,7 @@ static int IMA_ADPCM_decode(Uint8 **audio_buf, Uint32 *audio_len)
 			}
 
 			/* Store the initial sample we start with */
+			if (decoded + 2 > decoded_end) goto invalid_size;
 			decoded[0] = (Uint8)(state[c].sample&0xFF);
 			decoded[1] = (Uint8)(state[c].sample>>8);
 			decoded += 2;
@@ -390,6 +398,7 @@ static int IMA_ADPCM_decode(Uint8 **audio_buf, Uint32 *audio_len)
 		while ( samplesleft > 0 ) {
 			for ( c=0; c<channels; ++c ) {
 				if (encoded + 4 > encoded_end) goto invalid_size;
+				if (decoded + 4 * 4 * channels > decoded_end) goto invalid_size;
 				Fill_IMA_ADPCM_block(decoded, encoded,
 						c, channels, &state[c]);
 				encoded += 4;

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File CVE-2019-7572.patch of Package SDL.23722

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