[FFmpeg-devel] [PATCH 1/3] avformat/mov: Check sample_sizes before using it

[FFmpeg-devel] [PATCH 1/3] avformat/mov: Check sample_sizes before using it

[Michael Niedermayer]

Fixes: NULL pointer dereference
Fixes: 70569/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5247918563459072

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/mov.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mov.c b/libavformat/mov.c
index b74e43e2140..63db7d59a58 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -10060,6 +10060,10 @@ static int mov_read_header(AVFormatContext *s)
 
             st = item->st;
             sc = st->priv_data;
+
+            if (!sc->sample_sizes || !sc->sample_count)
+                return AVERROR_INVALIDDATA;
+
             st->codecpar->width  = item->width;
             st->codecpar->height = item->height;
 
-- 
2.45.2

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[FFmpeg-devel] [PATCH 2/3] avcodec/adpcm: Make sample count computation match code accesing samplesfor AV_CODEC_ID_ADPCM_DTK

[Michael Niedermayer]

Fixes: out of array access
Fixes: 70618/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ADPCM_DTK_fuzzer-4814907107770368

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/adpcm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index afdbeaa15ee..8f9a8a8c8e2 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -1050,6 +1050,8 @@ static int get_nb_samples(AVCodecContext *avctx, GetByteContext *gb,
         nb_samples = buf_size / (21 * ch) * 32;
         break;
     case AV_CODEC_ID_ADPCM_DTK:
+        nb_samples = buf_size / 32 * 28;
+        break;
     case AV_CODEC_ID_ADPCM_PSX:
         nb_samples = buf_size / (16 * ch) * 28;
         break;
-- 
2.45.2

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[FFmpeg-devel] [PATCH 3/3] avcodec/adpcm: Remove setting min_channel to value it is already set to

[Michael Niedermayer]

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/adpcm.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
index 8f9a8a8c8e2..6c53d0bcf39 100644
--- a/libavcodec/adpcm.c
+++ b/libavcodec/adpcm.c
@@ -260,10 +260,6 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
     case AV_CODEC_ID_ADPCM_IMA_AMV:
         max_channels = 1;
         break;
-    case AV_CODEC_ID_ADPCM_DTK:
-    case AV_CODEC_ID_ADPCM_EA:
-        min_channels = 1;
-        break;
     case AV_CODEC_ID_ADPCM_AFC:
     case AV_CODEC_ID_ADPCM_EA_R1:
     case AV_CODEC_ID_ADPCM_EA_R2:
-- 
2.45.2

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Re: [FFmpeg-devel] [PATCH 1/3] avformat/mov: Check sample_sizes before using it

[James Almer]

On 7/26/2024 6:08 PM, Michael Niedermayer wrote:
> Fixes: NULL pointer dereference
> Fixes: 70569/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5247918563459072
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>   libavformat/mov.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/libavformat/mov.c b/libavformat/mov.c
> index b74e43e2140..63db7d59a58 100644
> --- a/libavformat/mov.c
> +++ b/libavformat/mov.c
> @@ -10060,6 +10060,10 @@ static int mov_read_header(AVFormatContext *s)
>   
>               st = item->st;
>               sc = st->priv_data;
> +
> +            if (!sc->sample_sizes || !sc->sample_count)
> +                return AVERROR_INVALIDDATA;

Deja vu. Didn't you send something like this before?

Also, can i get the sample? As with other issues, we shouldn't reach 
this point if these were not allocated.

> +
>               st->codecpar->width  = item->width;
>               st->codecpar->height = item->height;
>   
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Re: [FFmpeg-devel] [PATCH 1/3] avformat/mov: Check sample_sizes before using it

[James Almer]

On 7/26/2024 7:11 PM, James Almer wrote:
> On 7/26/2024 6:08 PM, Michael Niedermayer wrote:
>> Fixes: NULL pointer dereference
>> Fixes: 
>> 70569/clusterfuzz-testcase-minimized-ffmpeg_dem_MOV_fuzzer-5247918563459072
>>
>> Found-by: continuous fuzzing process 
>> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
>> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>> ---
>>   libavformat/mov.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/libavformat/mov.c b/libavformat/mov.c
>> index b74e43e2140..63db7d59a58 100644
>> --- a/libavformat/mov.c
>> +++ b/libavformat/mov.c
>> @@ -10060,6 +10060,10 @@ static int mov_read_header(AVFormatContext *s)
>>               st = item->st;
>>               sc = st->priv_data;
>> +
>> +            if (!sc->sample_sizes || !sc->sample_count)
>> +                return AVERROR_INVALIDDATA;
> 
> Deja vu. Didn't you send something like this before?
> 
> Also, can i get the sample? As with other issues, we shouldn't reach 

No, it was me: 
https://ffmpeg.org//pipermail/ffmpeg-devel/2024-June/330391.html

Still, i want to check the sample because i'm not sure how this code is 
reached like this.

> this point if these were not allocated.
> 
>> +
>>               st->codecpar->width  = item->width;
>>               st->codecpar->height = item->height;
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Re: [FFmpeg-devel] [PATCH 3/3] avcodec/adpcm: Remove setting min_channel to value it is already set to

[Peter Ross]

[-- Attachment #1.1: Type: text/plain, Size: 869 bytes --]

On Fri, Jul 26, 2024 at 11:08:32PM +0200, Michael Niedermayer wrote:
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> ---
>  libavcodec/adpcm.c | 4 ----
>  1 file changed, 4 deletions(-)
> 
> diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
> index 8f9a8a8c8e2..6c53d0bcf39 100644
> --- a/libavcodec/adpcm.c
> +++ b/libavcodec/adpcm.c
> @@ -260,10 +260,6 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
>      case AV_CODEC_ID_ADPCM_IMA_AMV:
>          max_channels = 1;
>          break;
> -    case AV_CODEC_ID_ADPCM_DTK:
> -    case AV_CODEC_ID_ADPCM_EA:
> -        min_channels = 1;
> -        break;
>      case AV_CODEC_ID_ADPCM_AFC:
>      case AV_CODEC_ID_ADPCM_EA_R1:
>      case AV_CODEC_ID_ADPCM_EA_R2:
> -- 
> 2.45.2

please apply.

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)

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Re: [FFmpeg-devel] [PATCH 3/3] avcodec/adpcm: Remove setting min_channel to value it is already set to

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 1150 bytes --]

On Sat, Jul 27, 2024 at 09:17:01PM +1000, Peter Ross wrote:
> On Fri, Jul 26, 2024 at 11:08:32PM +0200, Michael Niedermayer wrote:
> > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > ---
> >  libavcodec/adpcm.c | 4 ----
> >  1 file changed, 4 deletions(-)
> > 
> > diff --git a/libavcodec/adpcm.c b/libavcodec/adpcm.c
> > index 8f9a8a8c8e2..6c53d0bcf39 100644
> > --- a/libavcodec/adpcm.c
> > +++ b/libavcodec/adpcm.c
> > @@ -260,10 +260,6 @@ static av_cold int adpcm_decode_init(AVCodecContext * avctx)
> >      case AV_CODEC_ID_ADPCM_IMA_AMV:
> >          max_channels = 1;
> >          break;
> > -    case AV_CODEC_ID_ADPCM_DTK:
> > -    case AV_CODEC_ID_ADPCM_EA:
> > -        min_channels = 1;
> > -        break;
> >      case AV_CODEC_ID_ADPCM_AFC:
> >      case AV_CODEC_ID_ADPCM_EA_R1:
> >      case AV_CODEC_ID_ADPCM_EA_R2:
> > -- 
> > 2.45.2
> 
> please apply.

will apply

thx

[...]

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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Good people do not need laws to tell them to act responsibly, while bad
people will find a way around the laws. -- Plato

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Re: [FFmpeg-devel] [PATCH 1/3] avformat/mov: Check sample_sizes before using it

[Michael Niedermayer]

[-- Attachment #1.1: Type: text/plain, Size: 685 bytes --]

Hi

On Fri, Jul 26, 2024 at 07:24:38PM -0300, James Almer wrote:
[...]
> > Deja vu. Didn't you send something like this before?
> > 
> > Also, can i get the sample? As with other issues, we shouldn't reach
> 
> No, it was me:
> https://ffmpeg.org//pipermail/ffmpeg-devel/2024-June/330391.html

Iam surprised we dont have more collisions
either way i will drop this on my side


> 
> Still, i want to check the sample because i'm not sure how this code is
> reached like this.

sure, sent privatly

thx

[...]
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Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

He who knows, does not speak. He who speaks, does not know. -- Lao Tsu

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Re: [FFmpeg-devel] [PATCH 1/3] avformat/mov: Check sample_sizes before using it

[James Almer]

On 7/27/2024 7:06 PM, Michael Niedermayer wrote:
> Hi
> 
> On Fri, Jul 26, 2024 at 07:24:38PM -0300, James Almer wrote:
> [...]
>>> Deja vu. Didn't you send something like this before?
>>>
>>> Also, can i get the sample? As with other issues, we shouldn't reach
>>
>> No, it was me:
>> https://ffmpeg.org//pipermail/ffmpeg-devel/2024-June/330391.html
> 
> Iam surprised we dont have more collisions

There's a stsz atom after the iinf atom that tries to replace 
sc->sample_sizes. It's inside the same meta box structure as the items 
instead of inside an stsd structure, which is not spec compliant, so 
ideally we should stop parsing it if that's the case.

I'll push my fix for now, but if such an stsz atom ends up allocating an 
array with a single entry, it will be accepted, so not exactly ideal.

> either way i will drop this on my side
> 
> 
>>
>> Still, i want to check the sample because i'm not sure how this code is
>> reached like this.
> 
> sure, sent privatly
> 
> thx
> 
> [...]
> 
> 
> _______________________________________________
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