[FFmpeg-devel] libavcodec/als: remove check for predictor order of a block

Umair Khan omerjerk at gmail.com
Thu Nov 2 22:32:12 EET 2017


On Fri, Oct 20, 2017 at 1:44 AM, Ronald S. Bultje <rsbultje at gmail.com> wrote:
> Hi,
> On Thu, Oct 19, 2017 at 4:03 PM, Umair Khan <omerjerk at gmail.com> wrote:
> > I tried decoding the file in both the cases and I don't see any
> > address related error in the console while decoding. Following is the
> > output after I apply the patch :-
> >
> [..]
> > Is there something which I'm missing?
> >
> You need to run under valgrind or compile with address sanitizer support:
> configure --toolchain=gcc-asan or --toolchain=clang-asan, depending on the
> name of clang on your system.

Thanks for the help. I was finally able to reproduce the error.

I have been trying to debug this heap-buffer-overflow error for some
days. I have finally found the source of the issue at least.


raw_samples pointer is overflowing inside that loop. I haven't thought
of a proper fix for this yet. I'll look at the documentation to
understand the logic first.

However, in case someone (Thilo?) already has some idea on fixing it,
that'd be great.


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