[FFmpeg-devel] [PATCH][RFC]lavu/mem: Do not realloc in av_fast_alloc() if size == min_size

Paul B Mahol onemda at gmail.com
Mon Jan 1 19:47:44 EET 2018

On 12/30/17, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 2017-12-30 17:24 GMT+01:00 Derek Buitenhuis <derek.buitenhuis at gmail.com>:
>> On 12/30/2017 1:44 PM, Carl Eugen Hoyos wrote:
>>> FFmpeg has an arbitrary allocation limit (2G iirc), av_fast_realloc()
>>> increases the allocation even if the requested is equal the already
>>> allocated size. I believe this can lead to unnecessary OOM (no
>>> testcase) if the requested (and already allocated) size is close to
>>> our limit.
>>> Additionally, this avoids an over-allocation for the mov stts patch I
>>> just sent.
>>> Attached patch changes the behaviour introduced 15 years ago.
>> I'm not aware of such a limit within the libraries (there is no allocation
>> tracking)?
> I just confirmed the ("arbitrary") limit defaults to INT_MAX which at least
> on some systems is 2G as claimed above.

Will you apply this or not?

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