You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
2.3 KiB
70 lines
2.3 KiB
4 years ago
|
From 210e68f70a5a007b0664239aa557e6b9d1b3e830 Mon Sep 17 00:00:00 2001
|
||
|
|
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
|
||
|
|
Date: Sat, 8 Jun 2019 18:02:09 -0700
|
||
|
|
Subject: [PATCH 02/11] CVE-2019-7578: Fix a buffer overread in InitIMA_ADPCM
|
||
|
|
If IMA ADPCM format chunk was too short, InitIMA_ADPCM() parsing it could
|
||
|
|
read past the end of chunk data. This patch fixes it.
|
||
|
|
MIME-Version: 1.0
|
||
|
|
Content-Type: text/plain; charset=UTF-8
|
||
|
|
Content-Transfer-Encoding: 8bit
|
||
|
|
|
||
|
|
CVE-2019-7578
|
||
|
|
https://bugzilla.libsdl.org/show_bug.cgi?id=4494
|
||
|
|
|
||
|
|
Signed-off-by: Petr Písař <ppisar@redhat.com>
|
||
|
|
|
||
|
|
--HG--
|
||
|
|
branch : SDL-1.2
|
||
|
|
---
|
||
|
|
src/audio/SDL_wave.c | 12 +++++++++---
|
||
|
|
1 file changed, 9 insertions(+), 3 deletions(-)
|
||
|
|
|
||
|
|
diff --git a/src/audio/SDL_wave.c b/src/audio/SDL_wave.c
|
||
|
|
index ba1fb5252..21ee4dc3c 100644
|
||
|
|
--- a/src/audio/SDL_wave.c
|
||
|
|
+++ b/src/audio/SDL_wave.c
|
||
|
|
@@ -222,11 +222,12 @@ static struct IMA_ADPCM_decoder {
|
||
|
|
struct IMA_ADPCM_decodestate state[2];
|
||
|
|
} IMA_ADPCM_state;
|
||
|
|
|
||
|
|
-static int InitIMA_ADPCM(WaveFMT *format)
|
||
|
|
+static int InitIMA_ADPCM(WaveFMT *format, int length)
|
||
|
|
{
|
||
|
|
- Uint8 *rogue_feel;
|
||
|
|
+ Uint8 *rogue_feel, *rogue_feel_end;
|
||
|
|
|
||
|
|
/* Set the rogue pointer to the IMA_ADPCM specific data */
|
||
|
|
+ if (length < sizeof(*format)) goto too_short;
|
||
|
|
IMA_ADPCM_state.wavefmt.encoding = SDL_SwapLE16(format->encoding);
|
||
|
|
IMA_ADPCM_state.wavefmt.channels = SDL_SwapLE16(format->channels);
|
||
|
|
IMA_ADPCM_state.wavefmt.frequency = SDL_SwapLE32(format->frequency);
|
||
|
|
@@ -235,11 +236,16 @@ static int InitIMA_ADPCM(WaveFMT *format)
|
||
|
|
IMA_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 + 2 > rogue_feel_end) goto too_short;
|
||
|
|
IMA_ADPCM_state.wSamplesPerBlock = ((rogue_feel[1]<<8)|rogue_feel[0]);
|
||
|
|
return(0);
|
||
|
|
+too_short:
|
||
|
|
+ SDL_SetError("Unexpected length of a chunk with an IMA ADPCM format");
|
||
|
|
+ return(-1);
|
||
|
|
}
|
||
|
|
|
||
|
|
static Sint32 IMA_ADPCM_nibble(struct IMA_ADPCM_decodestate *state,Uint8 nybble)
|
||
|
|
@@ -471,7 +477,7 @@ SDL_AudioSpec * SDL_LoadWAV_RW (SDL_RWops *src, int freesrc,
|
||
|
|
break;
|
||
|
|
case IMA_ADPCM_CODE:
|
||
|
|
/* Try to understand this */
|
||
|
|
- if ( InitIMA_ADPCM(format) < 0 ) {
|
||
|
|
+ if ( InitIMA_ADPCM(format, lenread) < 0 ) {
|
||
|
|
was_error = 1;
|
||
|
|
goto done;
|
||
|
|
}
|
||
|
|
--
|
||
|
|
2.21.0
|
||
|
|
|