bpo-35214: Fix OOB memory access in unicode escape parser (GH-10506)
Discovered using clang's MemorySanitizer when it ran python3's
test_fstring test_misformed_unicode_character_name.
An msan build will fail by simply executing: ./python -c 'u"\N"'
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index e5d026f..04ca5f3 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -6069,7 +6069,7 @@
}
message = "malformed \\N character escape";
- if (*s == '{') {
+ if (s < end && *s == '{') {
const char *start = ++s;
size_t namelen;
/* look for the closing brace */