Do not update pos if peek_bytes failed

marcelm · marcelm · commit a1504a7474f3 · 2023-09-29T10:55:43.000+02:00
diff --git a/Modules/_io/bytesio.c b/Modules/_io/bytesio.c
@@ -416,7 +416,9 @@ static PyObject *
 read_bytes(bytesio *self, Py_ssize_t size)
 {
     PyObject *bytes = peek_bytes(self, size);
-    self->pos += size;
+    if (bytes != NULL) {
+        self->pos += size;
+    }
     return bytes;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -416,7 +416,9 @@ static PyObject *`
`416`	`416`	`read_bytes(bytesio *self, Py_ssize_t size)`
`417`	`417`	`{`
`418`	`418`	`PyObject *bytes = peek_bytes(self, size);`
`419`		`- self->pos += size;`
	`419`	`+ if (bytes != NULL) {`
	`420`	`+ self->pos += size;`
	`421`	`+ }`
`420`	`422`	`return bytes;`
`421`	`423`	`}`
`422`	`424`