Re: [FFmpeg-devel] [PATCH 4/6] avcodec/evc_parse: Check log2_sub_gop_length

[James Almer <jamrial@gmail.com>]

On 6/18/2023 8:01 PM, James Almer wrote:
> On 6/18/2023 7:27 PM, James Almer wrote:
>> On 6/18/2023 6:50 PM, Michael Niedermayer wrote:
>>> Fixes: 1.70141e+38 is outside the range of representable values of 
>>> type 'int'
>>> Fixes: 
>>> 59883/clusterfuzz-testcase-minimized-ffmpeg_BSF_EVC_FRAME_MERGE_fuzzer-5557887217565696
>>>
>>> Found-by: continuous fuzzing process 
>>> https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
>>> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>>> ---
>>>   libavcodec/evc_parse.c | 2 ++
>>>   1 file changed, 2 insertions(+)
>>>
>>> diff --git a/libavcodec/evc_parse.c b/libavcodec/evc_parse.c
>>> index 44be5c5291..822b236423 100644
>>> --- a/libavcodec/evc_parse.c
>>> +++ b/libavcodec/evc_parse.c
>>> @@ -277,6 +277,8 @@ EVCParserSPS *ff_evc_parse_sps(EVCParserContext 
>>> *ctx, const uint8_t *bs, int bs_
>>>       if (!sps->sps_pocs_flag || !sps->sps_rpl_flag) {
>>>           sps->log2_sub_gop_length = get_ue_golomb(&gb);
>>> +        if (sps->log2_sub_gop_length > 5U)
>>> +            return NULL;
>>>           if (sps->log2_sub_gop_length == 0)
>>>               sps->log2_ref_pic_gap_length = get_ue_golomb(&gb);
>>>       }
>>
>> LGTM, but please let me apply it as part of my evc patchset to prevent 
>> conflicts.
> 
> Actually, this is leaving the SPS allocated in the array, which should 
> be freed if we're going to start erroring out on failed range checks.
> I'll amend it before applying it.

Applied.
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