multimedia/ffmpeg: backport some security fixes

Obtained from:	upstream (FFmpeg 3.4.3)
Approved by:	ports-secteam blanket

multimedia/ffmpeg/Makefile

@@ -3,6 +3,7 @@
 
 PORTNAME=	ffmpeg
 PORTVERSION=	3.4.2
+PORTREVISION=	1
 PORTEPOCH=	1
 CATEGORIES=	multimedia audio ipv6 net
 MASTER_SITES=	https://ffmpeg.org/releases/

multimedia/ffmpeg/files/patch-CVE-2018-12458

@@ -0,0 +1,32 @@
+commit bd1fd3ff4b0437153a6c4717f59ce31a7bba8ca0
+Author: Michael Niedermayer <michael@niedermayer.cc>
+Date:   Mon May 21 23:08:05 2018 +0200
+
+    avcodec/mpeg4videoenc: Use 64 bit for times in mpeg4_encode_gop_header()
+    
+    Fixes truncation
+    Fixes Assertion n <= 31 && value < (1U << n) failed at libavcodec/put_bits.h:169
+    Fixes: ffmpeg_crash_2.avi
+    
+    Found-by: Thuan Pham <thuanpv@comp.nus.edu.sg>, Marcel Böhme, Andrew Santosa and Alexandru RazvanCaciulescu with AFLSmart
+    
+    Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+    (cherry picked from commit e1182fac1afba92a4975917823a5f644bee7e6e8)
+    Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+---
+ libavcodec/mpeg4videoenc.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git libavcodec/mpeg4videoenc.c libavcodec/mpeg4videoenc.c
+index 494452c938..f6a5992df7 100644
+--- libavcodec/mpeg4videoenc.c
++++ libavcodec/mpeg4videoenc.c
+@@ -882,7 +882,7 @@ void ff_set_mpeg4_time(MpegEncContext *s)
+ 
+ static void mpeg4_encode_gop_header(MpegEncContext *s)
+ {
+-    int hours, minutes, seconds;
++    int64_t hours, minutes, seconds;
+     int64_t time;
+ 
+     put_bits(&s->pb, 16, 0);

multimedia/ffmpeg/files/patch-CVE-2018-7557

@@ -0,0 +1,51 @@
+commit ae49cc73f265a155e5c4b1715570aab3d9741b4d
+Author: Michael Niedermayer <michael@niedermayer.cc>
+Date:   Mon Feb 26 03:02:48 2018 +0100
+
+    avcodec/utvideodec: Check subsample factors
+    
+    Fixes: Out of array read
+    Fixes: heap_poc
+    
+    Found-by: GwanYeong Kim <gy741.kim@gmail.com>
+    Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+    (cherry picked from commit 7414d0bda7763f9bd69c26c068e482ab297c1c96)
+    Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+---
+ libavcodec/utvideodec.c | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git libavcodec/utvideodec.c libavcodec/utvideodec.c
+index d888cc3cdf..ebd9d55cf2 100644
+--- libavcodec/utvideodec.c
++++ libavcodec/utvideodec.c
+@@ -30,6 +30,7 @@
+ #define UNCHECKED_BITSTREAM_READER 1
+ 
+ #include "libavutil/intreadwrite.h"
++#include "libavutil/pixdesc.h"
+ #include "avcodec.h"
+ #include "bswapdsp.h"
+ #include "bytestream.h"
+@@ -789,6 +790,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
+ static av_cold int decode_init(AVCodecContext *avctx)
+ {
+     UtvideoContext * const c = avctx->priv_data;
++    int h_shift, v_shift;
+ 
+     c->avctx = avctx;
+ 
+@@ -886,6 +888,13 @@ static av_cold int decode_init(AVCodecContext *avctx)
+         return AVERROR_INVALIDDATA;
+     }
+ 
++    av_pix_fmt_get_chroma_sub_sample(avctx->pix_fmt, &h_shift, &v_shift);
++    if ((avctx->width  & ((1<<h_shift)-1)) ||
++        (avctx->height & ((1<<v_shift)-1))) {
++        avpriv_request_sample(avctx, "Odd dimensions");
++        return AVERROR_PATCHWELCOME;
++    }
++
+     return 0;
+ }
+ 

multimedia/ffmpeg/files/patch-CVE-2018-7751

@@ -0,0 +1,37 @@
+commit 3fa6e594a0f2575ddb6b2183961fde42ab5ab37b
+Author: Michael Niedermayer <michael@niedermayer.cc>
+Date:   Sat Mar 10 01:40:36 2018 +0100
+
+    avformat/img2dec: fix infinite loop
+    
+    Fixes: kira-poc
+    
+    Found-by: Kira <kira_cxy@foxmail.com>
+    Change suggested by Kira
+    Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+    (cherry picked from commit a6cba062051f345e8ebfdff34aba071ed73d923f)
+    Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+---
+ libavformat/img2dec.c | 6 +++++-
+ 1 file changed, 5 insertions(+), 1 deletion(-)
+
+diff --git libavformat/img2dec.c libavformat/img2dec.c
+index ecf64eaffa..2585634e7c 100644
+--- libavformat/img2dec.c
++++ libavformat/img2dec.c
+@@ -878,10 +878,14 @@ static int svg_probe(AVProbeData *p)
+ {
+     const uint8_t *b = p->buf;
+     const uint8_t *end = p->buf + p->buf_size;
++
+     if (memcmp(p->buf, "<?xml", 5))
+         return 0;
+     while (b < end) {
+-        b += ff_subtitles_next_line(b);
++        int inc = ff_subtitles_next_line(b);
++        if (!inc)
++            break;
++        b += inc;
+         if (b >= end - 4)
+             return 0;
+         if (!memcmp(b, "<svg", 4))

multimedia/ffmpeg/files/patch-CVE-2018-9841

@@ -0,0 +1,30 @@
+commit 43916494f8cac6ed294309e70de346e309d51058
+Author: Michael Niedermayer <michael@niedermayer.cc>
+Date:   Fri Mar 30 02:16:31 2018 +0200
+
+    avfilter/vf_signature: use av_strlcpy()
+    
+    Fixes: out of array access
+    
+    Found-by: Kira <kira_cxy@foxmail.com>
+    Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+    (cherry picked from commit 35eeff30caf34df835206f1c12bcf4b7c2bd6758)
+    Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
+---
+ libavfilter/vf_signature.c | 3 ++-
+ 1 file changed, 2 insertions(+), 1 deletion(-)
+
+diff --git libavfilter/vf_signature.c libavfilter/vf_signature.c
+index f0078ba1a6..d07b213f31 100644
+--- libavfilter/vf_signature.c
++++ libavfilter/vf_signature.c
+@@ -576,7 +576,8 @@ static int export(AVFilterContext *ctx, StreamContext *sc, int input)
+         /* error already handled */
+         av_assert0(av_get_frame_filename(filename, sizeof(filename), sic->filename, input) == 0);
+     } else {
+-        strcpy(filename, sic->filename);
++        if (av_strlcpy(filename, sic->filename, sizeof(filename)) >= sizeof(filename))
++            return AVERROR(EINVAL);
+     }
+     if (sic->format == FORMAT_XML) {
+         return xml_export(ctx, sc, filename);