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Add some gc safety around _mysql__fetch_row #348

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Merged
merged 3 commits into from
Feb 5, 2020
Merged

Add some gc safety around _mysql__fetch_row #348

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c540b40
Add some safety around _mysql__fetch_row
fried Mar 21, 2019
b5fd775
expand the commend about the gc module
fried Mar 25, 2019
1ec1aa7
Update _mysql.c
methane Feb 5, 2020
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10 changes: 8 additions & 2 deletions MySQLdb/_mysql.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1343,9 +1343,15 @@ _mysql_ResultObject_fetch_row(
convert_row = row_converters[how];
if (maxrows) {
if (!(r = PyTuple_New(maxrows))) goto error;
rowsadded = _mysql__fetch_row(self, &r, skiprows, maxrows,
convert_row);

// see: https://docs.python.org/3/library/gc.html#gc.get_referrers
// This function can get a reference to the tuple r, and if that
// code is preempted while holding a ref to r, the _PyTuple_Resize
// will raise a SystemError because the ref count is 2.
PyObject_GC_UnTrack(r);
rowsadded = _mysql__fetch_row(self, &r, skiprows, maxrows, convert_row);
if (rowsadded == -1) goto error;
PyObject_GC_Track(r);
} else {
if (self->use) {
maxrows = 1000;
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