Bugs item #1084766, was opened at 2004-12-13 17:41 Message generated for change (Comment added) made by jepler You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1084766&group_id=5470
Category: Python Library Group: Python 2.3 Status: Open Resolution: None Priority: 5 Submitted By: Mihai Ibanescu (misa) Assigned to: Nobody/Anonymous (nobody) Summary: sys.stdin segfaults on invalid stdin Initial Comment: Bug reported as: https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=140715 If stdin is invalid (e.g., redirected from a directory by mistake), python interpreter segfaults on any attempt to access it. In a case where one actually tries to read sys.stdin, I would expect something like Traceback (most recent call last): File "<string>", line 1, in ? IOError: [Errno 21] Is a directory ---------------------------------------------------------------------- Comment By: Jeff Epler (jepler) Date: 2004-12-18 21:25 Message: Logged In: YES user_id=2772 Duplicated here on a stale CVS version of 2.4. Here's some information from gdb: Starting program: /usr/src/cvs/python/dist/src/python -S -c '' < / [Thread debugging using libthread_db enabled] [New Thread -151074304 (LWP 6154)] Program received signal SIGSEGV, Segmentation fault. [Switching to Thread -151074304 (LWP 6154)] 0x08074f90 in PyDict_SetItem (op=0xf6fae79c, key=0xf6fb6f20, value=0x0) at Objects/dictobject.c:549 549 Py_INCREF(value); (gdb) where #0 0x08074f90 in PyDict_SetItem (op=0xf6fae79c, key=0xf6fb6f20, value=0x0) at Objects/dictobject.c:549 #1 0x08075e13 in PyDict_SetItemString (v=0xf6fae79c, key=0x8109d60 "stdin", item=0x0) at Objects/dictobject.c:1988 #2 0x080d6988 in _PySys_Init () at Python/sysmodule.c:961 #3 0x080d3e17 in Py_InitializeEx (install_sigs=1) at Python/pythonrun.c:190 #4 0x080d5815 in Py_Initialize () at Python/pythonrun.c:283 #5 0x08055159 in Py_Main (argc=4, argv=0xfefac1b4) at Modules/main.c:418 #6 0x08054e0f in main (argc=4, argv=0xfefac1b4) at Modules/python.c:23 The problem seems to be that PyFile_FromFile() returns NULL without tripping the PyErr_Occurred() test on my line 946 of sysmodule.c, because the call to fill_file_fields() returns NULL too. It looks like fill_file_fields is supposed to return NULL with an error set, but when dircheck() is called that early, PyExc_IOError is NULL, so no error is set. Maybe _PyExc_Init() must be moved earlier in startup. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=105470&aid=1084766&group_id=5470 _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
