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bpo-23689: re module, fix memory leak when a match is terminated by a signal or memory allocation failure #32283

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Merged
serhiy-storchaka merged 11 commits into from Apr 3, 2022
Merged

bpo-23689: re module, fix memory leak when a match is terminated by a signal or memory allocation failure #32283

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e5317fe
1. add variables
wjssz Apr 3, 2022
28e4d2d
2. add _CompileData class to _compile.py
wjssz Apr 3, 2022
7493fad
3. add repeat_count parameter to _sre.compile() function
wjssz Apr 3, 2022
b928335
4. emit repeat_count in sre_compile.py
wjssz Apr 3, 2022
dfec05d
5. change _validate_outer() parameter
wjssz Apr 3, 2022
db7e88b
6. validate in _validate_inner() / _validate_outer()
wjssz Apr 3, 2022
a43cb6e
7. allocate repeats_array for SRE_STATE
wjssz Apr 3, 2022
1560a0c
8. support code in sre_lib.h
wjssz Apr 3, 2022
96be025
9. add unit-tests
wjssz Apr 3, 2022
7ee3e66
a. skip -= field_number
wjssz Apr 3, 2022
e95b19f
b. improve unit-test
wjssz Apr 3, 2022
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7. allocate repeats_array for SRE_STATE
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@wjssz
wjssz committed Apr 3, 2022
commit a43cb6e2d5125a87753467d52180585eb968f93b
11 changes: 11 additions & 0 deletions Modules/_sre.c
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Original file line number Diff line number Diff line change
Expand Up @@ -427,6 +427,12 @@ state_init(SRE_STATE* state, PatternObject* pattern, PyObject* string,
state->lastmark = -1;
state->lastindex = -1;

state->repeats_array = PyMem_New(SRE_REPEAT, pattern->repeat_count);
if (!state->repeats_array) {
PyErr_NoMemory();
goto err;
}

state->buffer.buf = NULL;
ptr = getstring(string, &length, &isbytes, &charsize, &state->buffer);
if (!ptr)
Expand Down Expand Up @@ -476,6 +482,9 @@ state_init(SRE_STATE* state, PatternObject* pattern, PyObject* string,
safely casted to `void*`, see bpo-39943 for details. */
PyMem_Free((void*) state->mark);
state->mark = NULL;
PyMem_Free(state->repeats_array);
state->repeats_array = NULL;

if (state->buffer.buf)
PyBuffer_Release(&state->buffer);
return NULL;
Expand All @@ -491,6 +500,8 @@ state_fini(SRE_STATE* state)
/* See above PyMem_Del for why we explicitly cast here. */
PyMem_Free((void*) state->mark);
state->mark = NULL;
PyMem_Free(state->repeats_array);
state->repeats_array = NULL;
}

/* calculate offset from start of string */
Expand Down