[FFmpeg-devel] [PATCH 1/8] avutil/mem: Handle fast allocations near UINT_MAX properly

[Andreas Rheinhardt]

Anton Khirnov:
> Quoting Andreas Rheinhardt (2022-07-05 22:09:37)
>> av_fast_realloc and av_fast_mallocz? store the size of
>> the objects they allocate in an unsigned. Yet they overallocate
>> and currently they can allocate more than UINT_MAX bytes
>> in case a user has requested a size of about UINT_MAX * 16 / 17
>> or more if SIZE_MAX > UINT_MAX. In this case it is impossible
>> to store the true size of the buffer via the unsigned*;
>> future requests are likely to use the (re)allocation codepath
>> even if the buffer is actually large enough because of
>> the incorrect size.
>>
>> Fix this by ensuring that the actually allocated size
>> always fits into an unsigned. (This entails erroring out
>> in case the user requested more than UINT_MAX.)
> 
> I really dislike this av_fast_* naming.
> 
> Given that all these functions use unsigned int for something that
> should really be size_t, how about we deprecate them all and replace
> with something that has a sane naming convention and uses proper types?
> 

What name do you suggest?
And what's your opinion of the actual patch?

- Andreas