[FFmpeg-devel] [PATCH] ffmpeg: Initialize a potential gap in ctts_data in mov_build_index
michael at niedermayer.cc
Mon Mar 5 01:48:59 EET 2018
On Fri, Mar 02, 2018 at 03:43:35PM -0800, Matthew Wolenetz wrote:
> mov.c | 3 +++
> 1 file changed, 3 insertions(+)
> 6cffbdffaf318c72a8a3ea4d3c279c4126f5c0e2 0001-ffmpeg-Initialize-a-potential-gap-in-ctts_data-in-mo.patch
> From c40925a0d3ec1397cd6ed7d29bae573c5bdf1ec2 Mon Sep 17 00:00:00 2001
> From: Matt Wolenetz <wolenetz at chromium.org>
> Date: Fri, 2 Mar 2018 15:12:41 -0800
> Subject: [PATCH] ffmpeg: Initialize a potential gap in ctts_data in
> mov_read_ctts ignores ctts entries having count <= 0. Generally, the
> aggregate of all ctts entries' count fields resulting from mov_read_ctts
> can be less than the corresponding sample_count.
> mov_build_index attempts to normalize any existing ctts_data counts to
> be 1, to make a 1-1 mapping of a ctts_data entry to a sample.
> That 1-1 mapping left a tail of uninitialized ctts_data entries when the
> aggregate, normalized ctts_count < sample_count.
> Even more generally, later usage of ctts_data may depend on the entire
> ctts_allocated_size having been initialized.
> This change memsets the entire allocation of the normalized ctts_data in
> mov_build_index, to prevent use of uninitialized data later.
> Change-Id: I7fd7db255e3aeed076ee32c90cb2df211741c052
> Reviewed-on: https://chromium-review.googlesource.com/947110
> Reviewed-by: Xiaohan Wang <xhwang at chromium.org>
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
In fact, the RIAA has been known to suggest that students drop out
of college or go to community college in order to be able to afford
settlements. -- The RIAA
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