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Code Issues Releases Wiki Activity

Fixed a possible endless loop in cH264Parser::GetGolombUe()

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This commit is contained in:
Klaus Schmidinger 2014-03-08 15:04:09 +01:00
parent df03740741
commit ad1352f109
2 changed files with 10 additions and 6 deletions
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4
HISTORY
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@ -8203,7 +8203,7 @@ Video Disk Recorder Revision History
- Fixed detecting broken video data streams when recording.
- Fixed handling frame detection buffer length (reported by Eike Sauer).
2014-02-27: Version 2.1.6
2014-03-08: Version 2.1.6
- Revoked "Fixed some compiler warnings with Clang 3.4.1" from ci.c, because this
did not compile with older versions of gcc (thanks to Sören Moch).
@ -8211,3 +8211,5 @@ Video Disk Recorder Revision History
deleted in a sub folder.
- Fixed handling transfer mode on full featured DVB cards for encrypted channels
that have no audio pid (reported by Christian Winkler).
- Fixed a possible endless loop in cH264Parser::GetGolombUe(), which caused recordings
on some HD channels to get stuck and resulted in buffer overflows.

10
remux.c
View File

@ -4,7 +4,7 @@
* See the main source file 'vdr.c' for copyright information and
* how to reach the author.
*
* $Id: remux.c 3.3 2014/02/21 11:51:55 kls Exp $
* $Id: remux.c 3.4 2014/03/08 15:04:03 kls Exp $
*/
#include "remux.h"
@ -272,7 +272,7 @@ uchar cTsPayload::GetByte(void)
if (data[index] == TS_SYNC_BYTE && index + TS_SIZE <= length) { // to make sure we are at a TS header start and drop incomplete TS packets at the end
uchar *p = data + index;
if (TsPid(p) == pid) { // only handle TS packets for the initial PID
if (numPacketsPid++ > MAX_TS_PACKETS_FOR_VIDEO_FRAME_DETECTION)
if (++numPacketsPid > MAX_TS_PACKETS_FOR_VIDEO_FRAME_DETECTION)
return SetEof();
if (TsHasPayload(p)) {
if (index > 0 && TsPayloadStart(p)) // checking index to not skip the very first TS packet
@ -1252,7 +1252,7 @@ uint32_t cH264Parser::GetBits(int Bits)
uint32_t cH264Parser::GetGolombUe(void)
{
int z = -1;
for (int b = 0; !b; z++)
for (int b = 0; !b && z < 32; z++) // limiting z to no get stuck if GetBit() always returns 0
b = GetBit();
return (1 << z) - 1 + GetBits(z);
}
@ -1288,8 +1288,10 @@ int cH264Parser::Parse(const uchar *Data, int Length, int Pid)
case nutAccessUnitDelimiter: ParseAccessUnitDelimiter();
gotAccessUnitDelimiter = true;
break;
case nutSequenceParameterSet: ParseSequenceParameterSet();
case nutSequenceParameterSet: if (gotAccessUnitDelimiter) {
ParseSequenceParameterSet();
gotSequenceParameterSet = true;
}
break;
case nutCodedSliceNonIdr:
case nutCodedSliceIdr: if (gotAccessUnitDelimiter && gotSequenceParameterSet) {