bpo-44822: Don't truncate `str`s with embedded NULL chars returned by `sqlite3` UDF callbacks (GH-27588)

(cherry picked from commit 8f010dc920e1f6dc6a357e7cc1460a7a567c05c6)

Co-authored-by: Erlend Egeberg Aasland <erlend.aasland@innova.no>

3 files changed, 41 insertions, 3 deletions

diff --git a/Lib/sqlite3/test/userfunctions.py b/Lib/sqlite3/test/userfunctions.py
index 4290890..75e8035 100644
--- a/Lib/sqlite3/test/userfunctions.py
+++ b/Lib/sqlite3/test/userfunctions.py
@@ -28,6 +28,8 @@ import sqlite3 as sqlite
 
 def func_returntext():
     return "foo"
+def func_returntextwithnull():
+    return "1\x002"
 def func_returnunicode():
     return "bar"
 def func_returnint():
@@ -138,11 +140,21 @@ class AggrSum:
     def finalize(self):
         return self.val
 
+class AggrText:
+    def __init__(self):
+        self.txt = ""
+    def step(self, txt):
+        self.txt = self.txt + txt
+    def finalize(self):
+        return self.txt
+
+
 class FunctionTests(unittest.TestCase):
     def setUp(self):
         self.con = sqlite.connect(":memory:")
 
         self.con.create_function("returntext", 0, func_returntext)
+        self.con.create_function("returntextwithnull", 0, func_returntextwithnull)
         self.con.create_function("returnunicode", 0, func_returnunicode)
         self.con.create_function("returnint", 0, func_returnint)
         self.con.create_function("returnfloat", 0, func_returnfloat)
@@ -186,6 +198,12 @@ class FunctionTests(unittest.TestCase):
         self.assertEqual(type(val), str)
         self.assertEqual(val, "foo")
 
+    def test_func_return_text_with_null_char(self):
+        cur = self.con.cursor()
+        res = cur.execute("select returntextwithnull()").fetchone()[0]
+        self.assertEqual(type(res), str)
+        self.assertEqual(res, "1\x002")
+
     def test_func_return_unicode(self):
         cur = self.con.cursor()
         cur.execute("select returnunicode()")
@@ -364,6 +382,7 @@ class AggregateTests(unittest.TestCase):
         self.con.create_aggregate("checkType", 2, AggrCheckType)
         self.con.create_aggregate("checkTypes", -1, AggrCheckTypes)
         self.con.create_aggregate("mysum", 1, AggrSum)
+        self.con.create_aggregate("aggtxt", 1, AggrText)
 
     def tearDown(self):
         #self.cur.close()
@@ -457,6 +476,15 @@ class AggregateTests(unittest.TestCase):
         val = cur.fetchone()[0]
         self.assertIsNone(val)
 
+    def test_aggr_text(self):
+        cur = self.con.cursor()
+        for txt in ["foo", "1\x002"]:
+            with self.subTest(txt=txt):
+                cur.execute("select aggtxt(?) from test", (txt,))
+                val = cur.fetchone()[0]
+                self.assertEqual(val, txt)
+
+
 class AuthorizerTests(unittest.TestCase):
     @staticmethod
     def authorizer_cb(action, arg1, arg2, dbname, source):
diff --git a/Misc/NEWS.d/next/Library/2021-08-04-12-29-00.bpo-44822.zePNXA.rst b/Misc/NEWS.d/next/Library/2021-08-04-12-29-00.bpo-44822.zePNXA.rst
new file mode 100644
index 0000000..d078142
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2021-08-04-12-29-00.bpo-44822.zePNXA.rst
@@ -0,0 +1,3 @@
+:mod:`sqlite3` user-defined functions and aggregators returning
+:class:`strings <str>` with embedded NUL characters are no longer
+truncated. Patch by Erlend E. Aasland.
diff --git a/Modules/_sqlite/connection.c b/Modules/_sqlite/connection.c
index 9c05a15..f060ef1 100644
--- a/Modules/_sqlite/connection.c
+++ b/Modules/_sqlite/connection.c
@@ -549,10 +549,17 @@ _pysqlite_set_result(sqlite3_context* context, PyObject* py_val)
     } else if (PyFloat_Check(py_val)) {
         sqlite3_result_double(context, PyFloat_AsDouble(py_val));
     } else if (PyUnicode_Check(py_val)) {
-        const char *str = PyUnicode_AsUTF8(py_val);
-        if (str == NULL)
+        Py_ssize_t sz;
+        const char *str = PyUnicode_AsUTF8AndSize(py_val, &sz);
+        if (str == NULL) {
             return -1;
-        sqlite3_result_text(context, str, -1, SQLITE_TRANSIENT);
+        }
+        if (sz > INT_MAX) {
+            PyErr_SetString(PyExc_OverflowError,
+                            "string is longer than INT_MAX bytes");
+            return -1;
+        }
+        sqlite3_result_text(context, str, (int)sz, SQLITE_TRANSIENT);
     } else if (PyObject_CheckBuffer(py_val)) {
         Py_buffer view;
         if (PyObject_GetBuffer(py_val, &view, PyBUF_SIMPLE) != 0) {