Bugs item #1562308, was opened at 2006-09-20 11:50
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Category: Python Interpreter Core
Group: Python 2.5
Status: Open
Resolution: None
Priority: 5
Submitted By: Luke Moore (lukemoore)
Assigned to: Nobody/Anonymous (nobody)
Summary: uninitialized memory read in parsetok()
Initial Comment:
When running python2.5 under valgrind and running
exec ""
valgrind issues the following warning:
==6661== Conditional jump or move depends on
uninitialised value(s)
==6661== at 0x403EAF3: parsetok (parsetok.c:189)
==6661== by 0x40ED673: PyParser_ASTFromString
(pythonrun.c:1354)
==6661== by 0x40EF852: PyRun_StringFlags
(pythonrun.c:1225)
==6661== by 0x40CB7FF: PyEval_EvalFrameEx (ceval.c:4202)
==6661== by 0x40CC8E5: PyEval_EvalCodeEx (ceval.c:2833)
==6661== by 0x40CCA74: PyEval_EvalCode (ceval.c:494)
==6661== by 0x40EF3A1: PyRun_InteractiveOneFlags
(pythonrun.c:1264)
==6661== by 0x40EF5A2: PyRun_InteractiveLoopFlags
(pythonrun.c:714)
==6661== by 0x40EF6CA: PyRun_AnyFileExFlags
(pythonrun.c:683)
==6661== by 0x40F930D: Py_Main (main.c:496)
==6661== by 0x8048591: main (in /usr/bin/python2.5)
Valgrind does not give warnings when doing the same
thing with python2.4.3.
After further investigation, it looks like
tok->line_start is uninitialized. Initializing to null
in tok_new() removes the valgrind warning, but I have
no idea if this is the correct fix.
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