jpeg2000: check log2_cblk dimensions

Fixes out of array access
Fixes Ticket2895

Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 9a271a9368eaabf99e6c2046103acb33957e63b7)
avcodec/flashsv: check diff_start/height

Fixes out of array accesses
Fixes Ticket2844

Found-by: ami_stuff
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 880c73cd76109697447fbfbaa8e5ee5683309446)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/rpza: Perform pointer advance and checks before using the pointers

Fixes out of array accesses
Fixes Ticket2850

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 3819db745da2ac7fb3faacb116788c32f4753f34)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
avcodec/jpeg2000dec: Check cdx/y values more carefully

Some invalid values where not handled correctly in the later pixel
format matching code.
Fixes out of array accesses
Fixes Ticket2848

Found-by: Piotr Bandurski <ami_stuff@o2.pl>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 8bb11c3ca77b52e05a9ed1496a65f8a76e6e2d8f)

Conflicts:

	libavcodec/jpeg2000dec.c
jpeg2000: fix dereferencing invalid pointers

Found-by: Laurent Butti <laurentb@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 912ce9dd2080c5837285a471d750fa311e09b555)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
lavf/ftp: fix possible crash
(cherry picked from commit f3ace37a3b8c93218630a37b7df4dc195f1215a9)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
ffv1dec: check that global parameters dont change in version 0/1

Such changes are not allowed nor supported

Fixes Ticket2906

Found-by: ami_stuff
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 547d690d676064069d44703a1917e0dab7e33445)
avcodec/pngdsp: fix (un)signed type in end comparission

Fixes out of array accesses
Fixes Ticket2919

Found_by: ami_stuff
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 86736f59d6a527d8bc807d09b93f971c0fe0bb07)
avformat/avidec: match first index and first packet size=0 handling

Fixes Ticket2861

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 227a0eb5a92409572f2cecde6137529b83e7d495)

Conflicts:
	libavformat/avidec.c
avcodec/h264: set er.ref_count earlier

Fixes Ticket2910

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 93cf7b01950b9d8e1646227752b522d0275d32df)
avformat/lxfdec: use a parser to parse video frame headers

lxf needs a parser (or would need to set a few fields explicitly).
Fixes Ticket2917

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 8349be852be7f68fe0590584fd46c4d5f1c16b3d)
avcodec/ffv1dec: move initial_states init to init_thread_copy()

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit c72cca5a44d8a83e097a97a13990d421ba7a4c5d)
avcodec/ffv1dec: reorganize thread init/update

This moves some allocations to init, reducing possible failure modes in update.
Always copies from the previous context instead of just during init

Fixes Ticket2923

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 21dc3a3cc23c624630a4379f08a6efe0230de37a)
Avoid a deadlock when decoding wma.

Fixes ticket #2925.
(cherry picked from commit ec8a4841f7e81040f9a2757f23e70dff5e6b33a4)
w64dec: fix skipping of unknown guids

Regression since 14d50c1.
Fixes #2932.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
(cherry picked from commit 79b70e47a463057a3a48353ee1dd58671c11f86c)
w64dec: fix end position of summarylist guid

Noticed-by: James Almer

Signed-off-by: Paul B Mahol <onemda@gmail.com>
(cherry picked from commit 3e36dc8626f4721ea749286dae40169ee5cb7d04)
Read h264 headers from v4l2 to allow stream-copying.

Fixes ticket #2882.
Analyzed and tested by William C Bonner.
(cherry picked from commit e337c9d56408dc00a15887309488a1ff5cb06ba3)
avformat/matroskaenc: remove bogus prores tag

Fixes: ffmpeg -i input -c:v prores output.mkv

Signed-off-by: Paul B Mahol <onemda@gmail.com>
(cherry picked from commit 14851ca5f5a3af140085e82589e28e06c7cdefdc)

Conflicts:
	libavformat/matroskaenc.c
avformat/vobsub: fix seeking.

(cherry picked from commit f8678dcef3c5b0ea82e898e1f419863409fa135f)
avformat/subtitles: check lower bound for duration overlap seeking.

(cherry picked from commit 1ca4bf930bab681a79fb591330043675c7cfd798)