Issue #23099: Closing io.BytesIO with exported buffer is rejected now to

prevent corrupting exported buffer.

1 files changed, 6 insertions, 5 deletions

diff --git a/Python/traceback.c b/Python/traceback.c
index c2aba522bf..e3adc96ae8 100644
--- a/Python/traceback.c
+++ b/Python/traceback.c
@@ -231,7 +231,7 @@ _Py_FindSourceFile(PyObject *filename, char* namebuf, size_t namelen, PyObject *
         }
         strcpy(namebuf, PyBytes_AS_STRING(path));
         Py_DECREF(path);
-        if (strlen(namebuf) != len)
+        if (strlen(namebuf) != (size_t)len)
             continue; /* v contains '\0' */
         if (len > 0 && namebuf[len-1] != SEP)
             namebuf[len++] = SEP;
@@ -575,15 +575,16 @@ dump_ascii(int fd, PyObject *text)
             ch = PyUnicode_READ(kind, data, i);
         else
             ch = wstr[i];
-        if (ch < 128) {
+        if (' ' <= ch && ch <= 126) {
+            /* printable ASCII character */
             char c = (char)ch;
             write(fd, &c, 1);
         }
-        else if (ch < 0xff) {
+        else if (ch <= 0xff) {
             PUTS(fd, "\\x");
             dump_hexadecimal(fd, ch, 2);
         }
-        else if (ch < 0xffff) {
+        else if (ch <= 0xffff) {
             PUTS(fd, "\\u");
             dump_hexadecimal(fd, ch, 4);
         }
@@ -678,7 +679,7 @@ write_thread_id(int fd, PyThreadState *tstate, int is_current)
         PUTS(fd, "Current thread 0x");
     else
         PUTS(fd, "Thread 0x");
-    dump_hexadecimal(fd, (unsigned long)tstate->thread_id, sizeof(long)*2);
+    dump_hexadecimal(fd, (unsigned long)tstate->thread_id, sizeof(unsigned long)*2);
     PUTS(fd, " (most recent call first):\n");
 }