On 05/11/2011 02:49 PM, Ronald S. Bultje wrote:

> Hi,
> 
> On Wed, May 11, 2011 at 2:46 PM, Justin Ruggles
> <[email protected]> wrote:
>> On 05/10/2011 11:29 AM, Ronald S. Bultje wrote:
>>> ---
>>>  libavcodec/mdec.c |    3 ++-
>>>  1 files changed, 2 insertions(+), 1 deletions(-)
>>>
>>> diff --git a/libavcodec/mdec.c b/libavcodec/mdec.c
>>> index 545b919..9b6e6b6 100644
>>> --- a/libavcodec/mdec.c
>>> +++ b/libavcodec/mdec.c
>>> @@ -125,7 +125,8 @@ static inline int decode_mb(MDECContext *a, DCTELEM 
>>> block[6][64]){
>>>      a->dsp.clear_blocks(block[0]);
>>>
>>>      for(i=0; i<6; i++){
>>> -        if( mdec_decode_block_intra(a, block[ block_index[i] ], 
>>> block_index[i]) < 0)
>>> +        if( mdec_decode_block_intra(a, block[ block_index[i] ], 
>>> block_index[i]) < 0 ||
>>> +            get_bits_left(&a->gb) < 0)
>>>              return -1;
>>>      }
>>>      return 0;
>>
>> If get_bits_left() < 0 doesn't that mean that it has already overread?
>> How much can it have possibly overread by at this point, and is that <=
>> FF_INPUT_BUFFER_PADDING_SIZE?
> 
> When I had a look at it, it seemed to always be <
> FF_INPUT_BUFFER_PADDING_SIZE, yes.


probably ok then. was that a fuzzed file or just some random sample?

-Justin
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