[Python-checkins] cpython (merge 3.5 -> 3.6): Issue #29444: Fixed out-of-bounds buffer access in the group() method of
serhiy.storchaka
python-checkins at python.org
Sat Feb 4 15:58:06 EST 2017
https://hg.python.org/cpython/rev/393969776989
changeset: 106419:393969776989
branch: 3.6
parent: 106416:b60b46ad8751
parent: 106418:4e65d6c20dae
user: Serhiy Storchaka <storchaka at gmail.com>
date: Sat Feb 04 22:55:40 2017 +0200
summary:
Issue #29444: Fixed out-of-bounds buffer access in the group() method of
the match object. Based on patch by WGH.
files:
Lib/test/test_re.py | 10 ++++++++++
Misc/NEWS | 3 +++
Modules/_sre.c | 9 +++++++--
3 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
--- a/Lib/test/test_re.py
+++ b/Lib/test/test_re.py
@@ -1824,6 +1824,16 @@
warnings.simplefilter('error', BytesWarning)
self.assertNotEqual(pattern3, pattern1)
+ def test_bug_29444(self):
+ s = bytearray(b'abcdefgh')
+ m = re.search(b'[a-h]+', s)
+ m2 = re.search(b'[e-h]+', s)
+ self.assertEqual(m.group(), b'abcdefgh')
+ self.assertEqual(m2.group(), b'efgh')
+ s[:] = b'xyz'
+ self.assertEqual(m.group(), b'xyz')
+ self.assertEqual(m2.group(), b'')
+
class PatternReprTests(unittest.TestCase):
def check(self, pattern, expected):
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -55,6 +55,9 @@
Library
-------
+- Issue #29444: Fixed out-of-bounds buffer access in the group() method of
+ the match object. Based on patch by WGH.
+
- Issue #29335: Fix subprocess.Popen.wait() when the child process has
exited to a stopped instead of terminated state (ex: when under ptrace).
diff --git a/Modules/_sre.c b/Modules/_sre.c
--- a/Modules/_sre.c
+++ b/Modules/_sre.c
@@ -2003,6 +2003,7 @@
Py_buffer view;
PyObject *result;
void* ptr;
+ Py_ssize_t i, j;
if (index < 0 || index >= self->groups) {
/* raise IndexError if we were given a bad group number */
@@ -2024,8 +2025,12 @@
ptr = getstring(self->string, &length, &isbytes, &charsize, &view);
if (ptr == NULL)
return NULL;
- result = getslice(isbytes, ptr,
- self->string, self->mark[index], self->mark[index+1]);
+
+ i = self->mark[index];
+ j = self->mark[index+1];
+ i = Py_MIN(i, length);
+ j = Py_MIN(j, length);
+ result = getslice(isbytes, ptr, self->string, i, j);
if (isbytes && view.buf != NULL)
PyBuffer_Release(&view);
return result;
--
Repository URL: https://hg.python.org/cpython
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