[vdr] vdr 1.3.35 crashing when leaving a recording at the end

Joachim Wilke joachim.wilke at gmail.com
Tue Nov 1 19:29:28 CET 2005


Hi everyone,

i have experienced some strange behaviour of my plain vanilla vdr.
When vdr reaches the end of a replay it segfaults. Core file analysis
showed the following backtrace:

#0  cUnbufferedFile::Seek(long, int) (this=0x0, Offset=0, Whence=0) at
tools.c:884
#1  0x080dab2c in cFileName::SetOffset(int, int) (this=0xb56a1540,
Number=3, Offset=0) at recording.c:1345
#2  0x080dac5d in cFileName::NextFile() (this=0x0) at recording.c:1358
#3  0x0809d8e1 in cDvbPlayer::NextFile(unsigned char, int)
(this=0xb56a1540, FileNumber=64 '@', FileOffset=0) at dvbplayer.c:306
#4  0x0809db67 in cDvbPlayer::Action() (this=0x3) at thread.h:94
#5  0x080fce56 in cThread::StartThread(cThread*) (Thread=0x3) at thread.c:234
#6  0xb7fbab63 in start_thread () from /lib/tls/libpthread.so.0

It seems that vdr tries to access a reference to an cUbufferedFile
object in cFileName::SetOffset which is a null pointer. The following
quick and dirty hack solved the crash, but as I don't know this code
deep enough it may have other side effects.

--- recording.c.sav     Mon Oct 31 13:27:58 2005
+++ recording.c Tue Nov  1 19:20:27 2005
@@ -1342,7 +1342,7 @@ cUnbufferedFile *cFileName::SetOffset(in
         // found a non existing file suffix
         }
      if (Open() >= 0) {
-        if (!record && Offset >= 0 && file->Seek(Offset, SEEK_SET) != Offset) {
+        if (!record && Offset >= 0 && file && file->Seek(Offset,
SEEK_SET) != Offset) {
            LOG_ERROR_STR(fileName);
            return NULL;
            }

Regards,
Joachim.



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