From: Alexey Izbyshev <izbyshev@ispras.ru>
Date: Fri, 26 May 2023 16:34:14 +0000 (+0300)
Subject: mbrtowc: Fix wrong return value when n > UINT_MAX
X-Git-Url: http://nsz.repo.hu/git/?p=musl;a=commitdiff_plain;h=4653b98711f280270fa049654460610f587ba7b4

mbrtowc: Fix wrong return value when n > UINT_MAX

mbrtowc truncates n to unsigned int when storing its copy.
If n > UINT_MAX and the locale is not POSIX, the function will
return a wrong value greater than UINT_MAX on the success path.
---

diff --git a/src/multibyte/mbrtowc.c b/src/multibyte/mbrtowc.c
index c94819e7..7824997e 100644
--- a/src/multibyte/mbrtowc.c
+++ b/src/multibyte/mbrtowc.c
@@ -8,7 +8,7 @@ size_t mbrtowc(wchar_t *restrict wc, const char *restrict src, size_t n, mbstate
 	static unsigned internal_state;
 	unsigned c;
 	const unsigned char *s = (const void *)src;
-	const unsigned N = n;
+	const size_t N = n;
 	wchar_t dummy;
 
 	if (!st) st = (void *)&internal_state;