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URL: http://github.com/python/cpython/pull/150275/files

sets.com/assets/primer-primitives-b39ad27f3538ace3.css" /> gh-150207: Raise MemoryError on tokenizer allocation failure instead of crashing by grantlouisherman · Pull Request #150275 · python/cpython · GitHub
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gh-150207: Raise MemoryError on tokenizer allocation failure instead of crashing #150275

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Merged
pablogsal merged 6 commits into from
Jun 6, 2026
+9 −1
Merged

gh-150207: Raise MemoryError on tokenizer allocation failure instead of crashing #150275

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9b58c3e
type-crash(): throw a no mem error when malloc fails in tokenizer
grantlouisherman May 22, 2026
d19d136
📜🤖 Added by blurb_it.
blurb-it[bot] May 22, 2026
dc85268
Update Misc/NEWS.d/next/Core_and_Builtins/2026-05-22-21-52-38.gh-issu…
grantlouisherman Jun 1, 2026
052acb1
addressing aisk diff comments
grantlouisherman Jun 1, 2026
d39b622
Update Parser/tokenizer/file_tokenizer.c
grantlouisherman Jun 3, 2026
d21b8b8
gh-150207: Set MemoryError in readline tokenizer init
pablogsal Jun 6, 2026
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-05-22-21-52-38.gh-issue-150207.l2BUtI.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Fix a crash when a memory allocation fails during tokenizer initialization. A proper :exc:`MemoryError` is now raised instead.
5 changes: 4 additions & 1 deletion Parser/lexer/state.c
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Expand Up @@ -15,8 +15,11 @@ _PyTokenizer_tok_new(void)
struct tok_state *tok = (struct tok_state *)PyMem_Calloc(
1,
sizeof(struct tok_state));
if (tok == NULL)
if (tok == NULL) {
PyErr_NoMemory();
return NULL;
}

tok->buf = tok->cur = tok->inp = NULL;
tok->fp_interactive = 0;
tok->interactive_src_start = NULL;
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1 change: 1 addition & 0 deletions Parser/tokenizer/file_tokenizer.c
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Expand Up @@ -378,6 +378,7 @@ _PyTokenizer_FromFile(FILE *fp, const char* enc,
return NULL;
if ((tok->buf = (char *)PyMem_Malloc(BUFSIZ)) == NULL) {
_PyTokenizer_Free(tok);
PyErr_NoMemory();
return NULL;
}
tok->cur = tok->inp = tok->buf;
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2 changes: 2 additions & 0 deletions Parser/tokenizer/helpers.c
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Expand Up @@ -193,6 +193,7 @@ _PyTokenizer_new_string(const char *s, Py_ssize_t len, struct tok_state *tok)
char* result = (char *)PyMem_Malloc(len + 1);
if (!result) {
tok->done = E_NOMEM;
PyErr_NoMemory();
return NULL;
}
memcpy(result, s, len);
Expand Down Expand Up @@ -221,6 +222,7 @@ _PyTokenizer_translate_newlines(const char *s, int exec_input, int preserve_crlf
buf = PyMem_Malloc(needed_length);
if (buf == NULL) {
tok->done = E_NOMEM;
PyErr_NoMemory();
return NULL;
}
for (current = buf; *s; s++, current++) {
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1 change: 1 addition & 0 deletions Parser/tokenizer/readline_tokenizer.c
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Expand Up @@ -114,6 +114,7 @@ _PyTokenizer_FromReadline(PyObject* readline, const char* enc,
return NULL;
if ((tok->buf = (char *)PyMem_Malloc(BUFSIZ)) == NULL) {
_PyTokenizer_Free(tok);
PyErr_NoMemory();
return NULL;
}
tok->cur = tok->inp = tok->buf;
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