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| author | Mark Dickinson <dickinsm@gmail.com> | 2009-09-29 19:21:35 (GMT) |
|---|---|---|
| committer | Mark Dickinson <dickinsm@gmail.com> | 2009-09-29 19:21:35 (GMT) |
| commit | 2683ab04a6859681149d6c0851ece719fdc8237c (patch) | |
| tree | 69b53685dcc216f3b68a2e60b592d7c0a063f363 /Python/marshal.c | |
| parent | ead1d62d3239109656d4b3fd2f99461dddb2fae1 (diff) | |
| download | cpython-2683ab04a6859681149d6c0851ece719fdc8237c.zip cpython-2683ab04a6859681149d6c0851ece719fdc8237c.tar.gz cpython-2683ab04a6859681149d6c0851ece719fdc8237c.tar.bz2 | |
Merged revisions 75141 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk
........
r75141 | mark.dickinson | 2009-09-29 20:01:06 +0100 (Tue, 29 Sep 2009) | 3 lines
Issue #7019: Unmarshalling of bad long data could produce unnormalized
PyLongs. Raise ValueError instead.
........
Diffstat (limited to 'Python/marshal.c')
| -rw-r--r-- | Python/marshal.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/Python/marshal.c b/Python/marshal.c index 54d19d5..256285b 100644 --- a/Python/marshal.c +++ b/Python/marshal.c @@ -553,7 +553,7 @@ static PyObject * r_PyLong(RFILE *p) { PyLongObject *ob; - int size, i, j, md; + int size, i, j, md, shorts_in_top_digit; long n; digit d; @@ -566,7 +566,8 @@ r_PyLong(RFILE *p) return NULL; } - size = 1 + (ABS(n)-1) / PyLong_MARSHAL_RATIO; + size = 1 + (ABS(n) - 1) / PyLong_MARSHAL_RATIO; + shorts_in_top_digit = 1 + (ABS(n) - 1) % PyLong_MARSHAL_RATIO; ob = _PyLong_New(size); if (ob == NULL) return NULL; @@ -583,12 +584,21 @@ r_PyLong(RFILE *p) ob->ob_digit[i] = d; } d = 0; - for (j=0; j < (ABS(n)-1)%PyLong_MARSHAL_RATIO + 1; j++) { + for (j=0; j < shorts_in_top_digit; j++) { md = r_short(p); if (md < 0 || md > PyLong_MARSHAL_BASE) goto bad_digit; + /* topmost marshal digit should be nonzero */ + if (md == 0 && j == shorts_in_top_digit - 1) { + Py_DECREF(ob); + PyErr_SetString(PyExc_ValueError, + "bad marshal data (unnormalized long data)"); + return NULL; + } d += (digit)md << j*PyLong_MARSHAL_SHIFT; } + /* top digit should be nonzero, else the resulting PyLong won't be + normalized */ ob->ob_digit[size-1] = d; return (PyObject *)ob; bad_digit: |