[mythtv-commits] Ticket #256: Patch for osdsurface memory corruption

MythTV mythtv at cvs.mythtv.org
Wed Aug 24 16:32:10 UTC 2005

#256: Patch for osdsurface memory corruption
 Reporter:  shrybman at aei.ca  |       Owner:  ijr
     Type:  defect           |      Status:  new
 Priority:  minor            |   Milestone:     
Component:  mythtv           |     Version:     
 Severity:  medium           |         Cc:                   |  
 This patch fixes memory corruption due to memsetting off the end of the
 array. I suspect it was the cause of this backtrace:
 (gdb) bt
 #0  0xffffe410 in __kernel_vsyscall ()
 #1  0xb6916921 in raise () from /lib/tls/i686/cmov/libc.so.6
 #2  0xb691827b in abort () from /lib/tls/i686/cmov/libc.so.6
 #3  0xb694cf77 in __fsetlocking () from /lib/tls/i686/cmov/libc.so.6
 #4  0xb6953597 in malloc_usable_size () from /lib/tls/i686/cmov/libc.so.6
 #5  0xb6953a32 in free () from /lib/tls/i686/cmov/libc.so.6
 #6  0x412061c1 in operator delete () from /usr/lib/libstdc++.so.6
 #7  0x4120621c in operator delete[] () from /usr/lib/libstdc++.so.6
 #8  0xb7c4e307 in ~OSDSurface (this=0x9a9f170) at osdsurface.cpp:80
 #9  0xb7c28879 in ~OSD (this=0x92b8e98) at osd.cpp:104
 #10 0xb7bead58 in ~NuppelVideoPlayer (this=0x90fe518)
     at NuppelVideoPlayer.cpp:229
 #11 0xb7bc0ff8 in TV::TeardownPlayer (this=0x9014220) at tv_play.cpp:1153
 #12 0xb7bbfc5b in TV::StopStuff (this=0x9014220, stopRingBuffers=true,
     stopPlayers=true, stopRecorders=false) at tv_play.cpp:1038
 #13 0xb7bbe7ba in TV::HandleStateChange (this=0x9014220) at
 #14 0xb7bc1736 in TV::RunTV (this=0x9014220) at tv_play.cpp:1254
 #15 0xb7bc1217 in TV::EventThread (param=0x9014220) at tv_play.cpp:1199
 #16 0xb6a4fe40 in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
 #17 0xb69be60e in clone () from /lib/tls/i686/cmov/libc.so.6

 I am not 100% sure this is the correct fix, but it does seem to work well.



Ticket URL: <http://cvs.mythtv.org/trac/ticket/256>
MythTV <http://www.mythtv.org/>

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