Package: dvbcut
Version: 0.5.4+svn178-7
Severity: important
Tags: patch
Dear Maintainer,
* What led up to the situation?
- opening an DVB-S transport stream
- setting some start and end marks
- export video with default options (MPEG program stream/DVD DVBCUT
multiplexer)
* What was the outcome of this action?
- dvbcut crashed
* What outcome did you expect instead?
- mpeg file get saved
Call Stack:
Program received signal SIGSEGV, Segmentation fault.
av_buffer_unref (buf=buf@entry=0x7fff1b74c6b0) at
/home/build/libavutil/libav-10.1/libavutil/buffer.c:111
111 b = (*buf)->buffer;
(gdb) bt
#0 av_buffer_unref (buf=buf@entry=0x7fff1b74c6b0) at
/home/build/libavutil/libav-10.1/libavutil/buffer.c:111
#1 0x00007f7aed422f44 in av_free_packet (pkt=pkt@entry=0x7fff1b74c6b0) at
/home/build/libavutil/libav-10.1/libavcodec/avpacket.c:247
#2 0x00007f7aed705e40 in avcodec_encode_video2 (avctx=0xfbdea0,
avpkt=0x7fff1b74c6b0, frame=0x149c740, got_packet_ptr=0x7fff1b74c67c) at
/home/build/libavutil/libav-10.1/libavcodec/utils.c:1331
#3 0x000000000043c00e in mpgfile::recodevideo (this=this@entry=0xf6a510,
mux=..., start=5638, stop=stop@entry=5640, offset=offset@entry=1384514230,
savedpics=savedpics@entry=1524, savepics=1524, log=0x14360b8) at
mpgfile.cpp:753
#4 0x000000000043d175 in mpgfile::savempg (this=0xf6a510, mux=...,
start=<optimized out>, start@entry=4116, stop=stop@entry=5640, savedpics=1524,
savedpics@entry=0, savepics=1524, log=0x14360b8) at mpgfile.cpp:682
#5 0x0000000000417bc5 in dvbcut::fileExport (this=0xf218b0) at dvbcut.cpp:737
#6 0x00007f7aeabe7a0a in QMetaObject::activate(QObject*, QMetaObject const*,
int, void**) () from /usr/lib/x86_64-linux-gnu/libQtCore.so.4
Reason:
in function mpgfile::recodevideo a variable pkt is declared, but the field
pkt.buf is never initialized.
Later in function av_free_packet this member is checked for being non-zero and
in this case
the memory it points to freed by av_free_packet:
242 void av_free_packet(AVPacket *pkt)
243 {
244 if (pkt) {
245 FF_DISABLE_DEPRECATION_WARNINGS
246 if (pkt->buf)
247 av_buffer_unref(&pkt->buf);
Patch:
--- dvbcut-0.5.4+svn178.orig/src/mpgfile.cpp
+++ dvbcut-0.5.4+svn178/src/mpgfile.cpp
@@ -731,7 +731,7 @@ void mpgfile::recodevideo(muxer &mux, in
pts_t startpts=idx[idx.indexnr(start)].getpts();
while (outpicture<stop)
{
- AVPacket pkt;
+ AVPacket pkt = {0};
u_int8_t *buf=(u_int8_t*)m2v.writeptr();
int ret, got_output;
-- System Information:
Debian Release: jessie/sid
APT prefers testing-updates
APT policy: (990, 'testing-updates'), (990, 'testing'), (500,
'testing-proposed-updates')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 3.14-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Versions of packages dvbcut depends on:
ii liba52-0.7.4 0.7.4-17
ii libao4 1.1.0-2
ii libavcodec55 6:10.1-1
ii libavformat55 6:10.1-1
ii libavutil53 6:10.1-1
ii libc6 2.19-3
ii libgcc1 1:4.9.0-7
ii libmad0 0.15.1b-8
ii libqt4-network 4:4.8.6+dfsg-2
ii libqt4-qt3support 4:4.8.6+dfsg-2
ii libqt4-sql 4:4.8.6+dfsg-2
ii libqt4-xml 4:4.8.6+dfsg-2
ii libqtcore4 4:4.8.6+dfsg-2
ii libqtgui4 4:4.8.6+dfsg-2
ii libstdc++6 4.9.0-7
ii libswscale2 6:10.1-1
Versions of packages dvbcut recommends:
ii mplayer2 [mplayer] 2.0-728-g2c378c7-2
dvbcut suggests no packages.
-- no debconf information
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