File CVE-2019-7572.patch of Package SDL.23114
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;