[FFmpeg-devel] [PATCH v2 1/2] avcodec/vvc_mp4toannexb: check bytes left for nalu_len

[FFmpeg-devel] [PATCH v2 1/2] avcodec/vvc_mp4toannexb: check bytes left for nalu_len

[Nuo Mi]

Fixes: fuzzer timeout
Fixes: 65253/clusterfuzz-testcase-minimized-ffmpeg_BSF_VVC_MP4TOANNEXB_fuzzer-4972412487467008

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
---
 libavcodec/bsf/vvc_mp4toannexb.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/libavcodec/bsf/vvc_mp4toannexb.c b/libavcodec/bsf/vvc_mp4toannexb.c
index 25c3726918..36bdae8f49 100644
--- a/libavcodec/bsf/vvc_mp4toannexb.c
+++ b/libavcodec/bsf/vvc_mp4toannexb.c
@@ -155,10 +155,11 @@ static int vvc_extradata_to_annexb(AVBSFContext *ctx)
         }
 
         for (j = 0; j < cnt; j++) {
-            int nalu_len = bytestream2_get_be16(&gb);
+            const int nalu_len = bytestream2_get_be16(&gb);
 
-            if (4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len >
-                SIZE_MAX - new_extradata_size) {
+            if (!nalu_len ||
+                nalu_len > bytestream2_get_bytes_left(&gb) ||
+                4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX - new_extradata_size) {
                 ret = AVERROR_INVALIDDATA;
                 goto fail;
             }
-- 
2.25.1

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Re: [FFmpeg-devel] [PATCH v2 1/2] avcodec/vvc_mp4toannexb: check bytes left for nalu_len

[Andreas Rheinhardt]

Nuo Mi:
> Fixes: fuzzer timeout
> Fixes: 65253/clusterfuzz-testcase-minimized-ffmpeg_BSF_VVC_MP4TOANNEXB_fuzzer-4972412487467008
> 
> Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> ---
>  libavcodec/bsf/vvc_mp4toannexb.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/libavcodec/bsf/vvc_mp4toannexb.c b/libavcodec/bsf/vvc_mp4toannexb.c
> index 25c3726918..36bdae8f49 100644
> --- a/libavcodec/bsf/vvc_mp4toannexb.c
> +++ b/libavcodec/bsf/vvc_mp4toannexb.c
> @@ -155,10 +155,11 @@ static int vvc_extradata_to_annexb(AVBSFContext *ctx)
>          }
>  
>          for (j = 0; j < cnt; j++) {
> -            int nalu_len = bytestream2_get_be16(&gb);
> +            const int nalu_len = bytestream2_get_be16(&gb);
>  
> -            if (4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len >
> -                SIZE_MAX - new_extradata_size) {
> +            if (!nalu_len ||
> +                nalu_len > bytestream2_get_bytes_left(&gb) ||
> +                4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX - new_extradata_size) {
>                  ret = AVERROR_INVALIDDATA;
>                  goto fail;
>              }

What about growing the packet?

- Andreas

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Re: [FFmpeg-devel] [PATCH v2 1/2] avcodec/vvc_mp4toannexb: check bytes left for nalu_len

[Nuo Mi]

On Fri, Feb 9, 2024 at 7:40 PM Andreas Rheinhardt <
andreas.rheinhardt@outlook.com> wrote:

> Nuo Mi:
> > Fixes: fuzzer timeout
> > Fixes:
> 65253/clusterfuzz-testcase-minimized-ffmpeg_BSF_VVC_MP4TOANNEXB_fuzzer-4972412487467008
> >
> > Found-by: continuous fuzzing process
> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> > Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> > Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> > ---
> >  libavcodec/bsf/vvc_mp4toannexb.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/libavcodec/bsf/vvc_mp4toannexb.c
> b/libavcodec/bsf/vvc_mp4toannexb.c
> > index 25c3726918..36bdae8f49 100644
> > --- a/libavcodec/bsf/vvc_mp4toannexb.c
> > +++ b/libavcodec/bsf/vvc_mp4toannexb.c
> > @@ -155,10 +155,11 @@ static int vvc_extradata_to_annexb(AVBSFContext
> *ctx)
> >          }
> >
> >          for (j = 0; j < cnt; j++) {
> > -            int nalu_len = bytestream2_get_be16(&gb);
> > +            const int nalu_len = bytestream2_get_be16(&gb);
> >
> > -            if (4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len >
> > -                SIZE_MAX - new_extradata_size) {
> > +            if (!nalu_len ||
> > +                nalu_len > bytestream2_get_bytes_left(&gb) ||
> > +                4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX
> - new_extradata_size) {
> >                  ret = AVERROR_INVALIDDATA;
> >                  goto fail;
> >              }
>
> What about growing the packet?
>
Hi Andreas,
Do you mean growing the packet only once for all nalus?
However, this would change the original behavior and result in more
duplicate code between the HEVC and VVC implementations.
I can do it, but I'll refactor duplications to h2656_mp4toannexb.c first.
Do you think that's okay?
Thank you


> - Andreas
>
> _______________________________________________
> ffmpeg-devel mailing list
> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
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> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
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Re: [FFmpeg-devel] [PATCH v2 1/2] avcodec/vvc_mp4toannexb: check bytes left for nalu_len

[Andreas Rheinhardt]

Nuo Mi:
> On Fri, Feb 9, 2024 at 7:40 PM Andreas Rheinhardt <
> andreas.rheinhardt@outlook.com> wrote:
> 
>> Nuo Mi:
>>> Fixes: fuzzer timeout
>>> Fixes:
>> 65253/clusterfuzz-testcase-minimized-ffmpeg_BSF_VVC_MP4TOANNEXB_fuzzer-4972412487467008
>>>
>>> Found-by: continuous fuzzing process
>> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
>>> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>>> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
>>> ---
>>>  libavcodec/bsf/vvc_mp4toannexb.c | 7 ++++---
>>>  1 file changed, 4 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/libavcodec/bsf/vvc_mp4toannexb.c
>> b/libavcodec/bsf/vvc_mp4toannexb.c
>>> index 25c3726918..36bdae8f49 100644
>>> --- a/libavcodec/bsf/vvc_mp4toannexb.c
>>> +++ b/libavcodec/bsf/vvc_mp4toannexb.c
>>> @@ -155,10 +155,11 @@ static int vvc_extradata_to_annexb(AVBSFContext
>> *ctx)
>>>          }
>>>
>>>          for (j = 0; j < cnt; j++) {
>>> -            int nalu_len = bytestream2_get_be16(&gb);
>>> +            const int nalu_len = bytestream2_get_be16(&gb);
>>>
>>> -            if (4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len >
>>> -                SIZE_MAX - new_extradata_size) {
>>> +            if (!nalu_len ||
>>> +                nalu_len > bytestream2_get_bytes_left(&gb) ||
>>> +                4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX
>> - new_extradata_size) {
>>>                  ret = AVERROR_INVALIDDATA;
>>>                  goto fail;
>>>              }
>>
>> What about growing the packet?
>>
> Hi Andreas,
> Do you mean growing the packet only once for all nalus?
> However, this would change the original behavior and result in more
> duplicate code between the HEVC and VVC implementations.
> I can do it, but I'll refactor duplications to h2656_mp4toannexb.c first.
> Do you think that's okay?
> Thank you
> 

I meant a simple check before growing the packet to ensure that there is
enough input left as the header claims there to be. Your original patch
added such a check, so I presumed that there is none. But there is one
(both here and in hevc_mp4toannexb). So my above point is moot.

- Andreas

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Re: [FFmpeg-devel] [PATCH v2 1/2] avcodec/vvc_mp4toannexb: check bytes left for nalu_len

[Nuo Mi]

On Sat, Feb 10, 2024 at 6:57 PM Andreas Rheinhardt <
andreas.rheinhardt@outlook.com> wrote:

> Nuo Mi:
> > On Fri, Feb 9, 2024 at 7:40 PM Andreas Rheinhardt <
> > andreas.rheinhardt@outlook.com> wrote:
> >
> >> Nuo Mi:
> >>> Fixes: fuzzer timeout
> >>> Fixes:
> >>
> 65253/clusterfuzz-testcase-minimized-ffmpeg_BSF_VVC_MP4TOANNEXB_fuzzer-4972412487467008
> >>>
> >>> Found-by: continuous fuzzing process
> >> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
> >>> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
> >>> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
> >>> ---
> >>>  libavcodec/bsf/vvc_mp4toannexb.c | 7 ++++---
> >>>  1 file changed, 4 insertions(+), 3 deletions(-)
> >>>
> >>> diff --git a/libavcodec/bsf/vvc_mp4toannexb.c
> >> b/libavcodec/bsf/vvc_mp4toannexb.c
> >>> index 25c3726918..36bdae8f49 100644
> >>> --- a/libavcodec/bsf/vvc_mp4toannexb.c
> >>> +++ b/libavcodec/bsf/vvc_mp4toannexb.c
> >>> @@ -155,10 +155,11 @@ static int vvc_extradata_to_annexb(AVBSFContext
> >> *ctx)
> >>>          }
> >>>
> >>>          for (j = 0; j < cnt; j++) {
> >>> -            int nalu_len = bytestream2_get_be16(&gb);
> >>> +            const int nalu_len = bytestream2_get_be16(&gb);
> >>>
> >>> -            if (4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len >
> >>> -                SIZE_MAX - new_extradata_size) {
> >>> +            if (!nalu_len ||
> >>> +                nalu_len > bytestream2_get_bytes_left(&gb) ||
> >>> +                4 + AV_INPUT_BUFFER_PADDING_SIZE + nalu_len > SIZE_MAX
> >> - new_extradata_size) {
> >>>                  ret = AVERROR_INVALIDDATA;
> >>>                  goto fail;
> >>>              }
> >>
> >> What about growing the packet?
> >>
> > Hi Andreas,
> > Do you mean growing the packet only once for all nalus?
> > However, this would change the original behavior and result in more
> > duplicate code between the HEVC and VVC implementations.
> > I can do it, but I'll refactor duplications to h2656_mp4toannexb.c first.
> > Do you think that's okay?
> > Thank you
> >
>
> I meant a simple check before growing the packet to ensure that there is
> enough input left as the header claims there to be. Your original patch
> added such a check, so I presumed that there is none. But there is one
> (both here and in hevc_mp4toannexb). So my above point is moot.

Thank you for the explanation.  Your suggestion for the original patch is
pretty good.  Thank you
Applied.

>


> - Andreas
>
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> ffmpeg-devel@ffmpeg.org
> https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
>
> To unsubscribe, visit link above, or email
> ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".
>
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