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[3.13] gh-101955: Fix SystemError in possesive quantifier with alternative and group (GH-111362) #126962

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Merged
merged 1 commit into from
Nov 18, 2024
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[3.13] gh-101955: Fix SystemError in possesive quantifier with alternative and group (GH-111362) #126962

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6 changes: 6 additions & 0 deletions Lib/test/test_re.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2641,6 +2641,12 @@ def test_bug_gh100061(self):
self.assertEqual(re.match("(?>(?:ab?c){1,3})", "aca").span(), (0, 2))
self.assertEqual(re.match("(?:ab?c){1,3}+", "aca").span(), (0, 2))

def test_bug_gh101955(self):
# Possessive quantifier with nested alternative with capture groups
self.assertEqual(re.match('((x)|y|z)*+', 'xyz').groups(), ('z', 'x'))
self.assertEqual(re.match('((x)|y|z){3}+', 'xyz').groups(), ('z', 'x'))
self.assertEqual(re.match('((x)|y|z){3,}+', 'xyz').groups(), ('z', 'x'))

@unittest.skipIf(multiprocessing is None, 'test requires multiprocessing')
def test_regression_gh94675(self):
pattern = re.compile(r'(?<=[({}])(((//[^\n]*)?[\n])([\000-\040])*)*'
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2023-10-26-16-36-22.gh-issue-101955.Ixu3IF.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix SystemError when match regular expression pattern containing some
combination of possessive quantifier, alternative and capture group.
18 changes: 18 additions & 0 deletions Modules/_sre/sre_lib.h
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Expand Up @@ -1306,6 +1306,17 @@ SRE(match)(SRE_STATE* state, const SRE_CODE* pattern, int toplevel)
pointer */
state->ptr = ptr;

/* Set state->repeat to non-NULL */
ctx->u.rep = repeat_pool_malloc(state);
if (!ctx->u.rep) {
RETURN_ERROR(SRE_ERROR_MEMORY);
}
ctx->u.rep->count = -1;
ctx->u.rep->pattern = NULL;
ctx->u.rep->prev = state->repeat;
ctx->u.rep->last_ptr = NULL;
state->repeat = ctx->u.rep;

/* Initialize Count to 0 */
ctx->count = 0;

Expand All @@ -1320,6 +1331,9 @@ SRE(match)(SRE_STATE* state, const SRE_CODE* pattern, int toplevel)
}
else {
state->ptr = ptr;
/* Restore state->repeat */
state->repeat = ctx->u.rep->prev;
repeat_pool_free(state, ctx->u.rep);
RETURN_FAILURE;
}
}
Expand Down Expand Up @@ -1392,6 +1406,10 @@ SRE(match)(SRE_STATE* state, const SRE_CODE* pattern, int toplevel)
}
}

/* Restore state->repeat */
state->repeat = ctx->u.rep->prev;
repeat_pool_free(state, ctx->u.rep);

/* Evaluate Tail */
/* Jump to end of pattern indicated by skip, and then skip
the SUCCESS op code that follows it. */
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