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bpo-23689: re module, fix memory leak when a match is terminated by a signal or memory allocation failure #32223

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bpo-23689: re module, fix memory leak when a match is terminated by a signal or memory allocation failure #32223

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d43cefe
1. add variables
wjssz Mar 31, 2022
f0d2621
2. add CompileData class to sre_compile.py
wjssz Mar 31, 2022
b8b9921
3. add repeat_count parameter to _sre.compile() function
wjssz Mar 31, 2022
17907f5
4. emit repeat_count in sre_compile.py
wjssz Mar 31, 2022
787ca6f
5. change _validate_outer() parameter
wjssz Mar 31, 2022
6ec932b
6. validate in _validate_inner()
wjssz Mar 31, 2022
01c4c29
7. allocate repeats_array for SRE_STATE
wjssz Mar 31, 2022
7631b7d
8. support code in sre_lib.h
wjssz Mar 31, 2022
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6. validate in _validate_inner()
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@wjssz
wjssz committed Apr 1, 2022
commit 6ec932b3fdd294345dc8df662e8d38676d7b45fe
18 changes: 13 additions & 5 deletions Modules/_sre.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1471,9 +1471,8 @@ _sre_compile_impl(PyObject *module, PyObject *pattern, int flags,

Py_INCREF(pattern);
self->pattern = pattern;

self->repeat_count = repeat_count;
self->flags = flags;

self->groups = groups;

if (PyDict_GET_SIZE(groupindex) > 0) {
Expand Down Expand Up @@ -1838,17 +1837,25 @@ _validate_inner(SRE_CODE *code, SRE_CODE *end, PatternObject *self)
case SRE_OP_REPEAT:
case SRE_OP_POSSESSIVE_REPEAT:
{
SRE_CODE op1 = op, min, max;
SRE_CODE op1 = op, min, max, repeat_index, _fields;
GET_SKIP;
GET_ARG; min = arg;
GET_ARG; max = arg;
if (min > max)
FAIL;
if (max > SRE_MAXREPEAT)
FAIL;
if (!_validate_inner(code, code+skip-3, self))
if (op1 != SRE_OP_POSSESSIVE_REPEAT) {
GET_ARG; repeat_index = arg;
if (repeat_index >= (size_t)self->repeat_count)
FAIL;
_fields = 4;
} else {
_fields = 3;
}
if (!_validate_inner(code, code+skip-_fields, self))
FAIL;
code += skip-3;
code += skip-_fields;
GET_OP;
if (op1 == SRE_OP_POSSESSIVE_REPEAT) {
if (op != SRE_OP_SUCCESS)
Expand Down Expand Up @@ -1966,6 +1973,7 @@ static int
_validate_outer(SRE_CODE *code, SRE_CODE *end, PatternObject *self)
{
if (self->groups < 0 || (size_t)self->groups > SRE_MAXGROUPS ||
self->repeat_count < 0 ||
code >= end || end[-1] != SRE_OP_SUCCESS)
FAIL;
return _validate_inner(code, end-1, self);
Expand Down