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Description: CVE-2019-7573
a heap-based buffer over-read in InitMS_ADPCM in audio/SDL_wave.c (inside the
wNumCoef loop).
---
Author: Abhijith PA <abhijith@debian.org>
Origin: https://bugzilla.libsdl.org/attachment.cgi?id=3620
Bug: https://bugzilla.libsdl.org/show_bug.cgi?id=4491
Last-Update: 2019-03-05
--- libsdl1.2-1.2.15.orig/src/audio/SDL_wave.c
+++ libsdl1.2-1.2.15/src/audio/SDL_wave.c
@@ -44,12 +44,13 @@ static struct MS_ADPCM_decoder {
struct MS_ADPCM_decodestate state[2];
} MS_ADPCM_state;
-static int InitMS_ADPCM(WaveFMT *format)
+static int InitMS_ADPCM(WaveFMT *format, int length)
{
- Uint8 *rogue_feel;
+ Uint8 *rogue_feel, *rogue_feel_end;
int i;
/* Set the rogue pointer to the MS_ADPCM specific data */
+ if (length < sizeof(*format)) goto too_short;
MS_ADPCM_state.wavefmt.encoding = SDL_SwapLE16(format->encoding);
MS_ADPCM_state.wavefmt.channels = SDL_SwapLE16(format->channels);
MS_ADPCM_state.wavefmt.frequency = SDL_SwapLE32(format->frequency);
@@ -58,9 +59,11 @@ static int InitMS_ADPCM(WaveFMT *format)
MS_ADPCM_state.wavefmt.bitspersample =
SDL_SwapLE16(format->bitspersample);
rogue_feel = (Uint8 *)format+sizeof(*format);
+ rogue_feel_end = (Uint8 *)format + length;
if ( sizeof(*format) == 16 ) {
rogue_feel += sizeof(Uint16);
}
+ if (rogue_feel + 4 > rogue_feel_end) goto too_short;
MS_ADPCM_state.wSamplesPerBlock = ((rogue_feel[1]<<8)|rogue_feel[0]);
rogue_feel += sizeof(Uint16);
MS_ADPCM_state.wNumCoef = ((rogue_feel[1]<<8)|rogue_feel[0]);
@@ -70,12 +73,16 @@ static int InitMS_ADPCM(WaveFMT *format)
return(-1);
}
for ( i=0; i<MS_ADPCM_state.wNumCoef; ++i ) {
+ if (rogue_feel + 4 > rogue_feel_end) goto too_short;
MS_ADPCM_state.aCoeff[i][0] = ((rogue_feel[1]<<8)|rogue_feel[0]);
rogue_feel += sizeof(Uint16);
MS_ADPCM_state.aCoeff[i][1] = ((rogue_feel[1]<<8)|rogue_feel[0]);
rogue_feel += sizeof(Uint16);
}
return(0);
+too_short:
+ SDL_SetError("Unexpected length of a chunk with a MS ADPCM format");
+ return(-1);
}
static Sint32 MS_ADPCM_nibble(struct MS_ADPCM_decodestate *state,
@@ -474,7 +481,7 @@ SDL_AudioSpec * SDL_LoadWAV_RW (SDL_RWop
break;
case MS_ADPCM_CODE:
/* Try to understand this */
- if ( InitMS_ADPCM(format) < 0 ) {
+ if ( InitMS_ADPCM(format, lenread) < 0 ) {
was_error = 1;
goto done;
}
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