diff options
Diffstat (limited to 'libre/sdl/SDL-1.2.15-CVE-2019-7573-CVE-2019-7576-Fix-buffer-overreads-in-.patch')
| -rw-r--r-- | libre/sdl/SDL-1.2.15-CVE-2019-7573-CVE-2019-7576-Fix-buffer-overreads-in-.patch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/libre/sdl/SDL-1.2.15-CVE-2019-7573-CVE-2019-7576-Fix-buffer-overreads-in-.patch b/libre/sdl/SDL-1.2.15-CVE-2019-7573-CVE-2019-7576-Fix-buffer-overreads-in-.patch new file mode 100644 index 000000000..767a3b207 --- /dev/null +++ b/libre/sdl/SDL-1.2.15-CVE-2019-7573-CVE-2019-7576-Fix-buffer-overreads-in-.patch @@ -0,0 +1,83 @@ +From 3e2c89e516701f3586dfeadec13932f665371d2a Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com> +Date: Fri, 15 Feb 2019 10:36:13 +0100 +Subject: [PATCH] CVE-2019-7573, CVE-2019-7576: Fix buffer overreads in + InitMS_ADPCM +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +If MS ADPCM format chunk was too short, InitMS_ADPCM() parsing it +could read past the end of chunk data. This patch fixes it. + +CVE-2019-7573 +https://bugzilla.libsdl.org/show_bug.cgi?id=4491 +CVE-2019-7576 +https://bugzilla.libsdl.org/show_bug.cgi?id=4490 + +Signed-off-by: Petr Písař <ppisar@redhat.com> +--- + src/audio/SDL_wave.c | 13 ++++++++++--- + 1 file changed, 10 insertions(+), 3 deletions(-) + +diff --git a/src/audio/SDL_wave.c b/src/audio/SDL_wave.c +index 91e89e8..1d446ed 100644 +--- a/src/audio/SDL_wave.c ++++ b/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, +@@ -485,7 +492,7 @@ SDL_AudioSpec * SDL_LoadWAV_RW (SDL_RWops *src, int freesrc, + 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; + } +-- +2.20.1 + |