From: Rich Felker <dalias@aerifal.cx>
Date: Sun, 1 Sep 2013 02:47:44 +0000 (-0400)
Subject: avoid crash in scanf when invalid %m format is encountered
X-Git-Url: http://nsz.repo.hu/git/?a=commitdiff_plain;h=cbb8a6979038f96d3f67c659363cebf0615c42ba;p=musl

avoid crash in scanf when invalid %m format is encountered

invalid format strings invoke undefined behavior, so this is not a
conformance issue, but it's nicer for scanf to report the error safely
instead of calling free on a potentially-uninitialized pointer or a
pointer to memory belonging to the caller.
---

diff --git a/src/stdio/vfscanf.c b/src/stdio/vfscanf.c
index 68c8e2cf..c0e607f5 100644
--- a/src/stdio/vfscanf.c
+++ b/src/stdio/vfscanf.c
@@ -118,6 +118,8 @@ int vfscanf(FILE *restrict f, const char *restrict fmt, va_list ap)
 		}
 
 		if (*p=='m') {
+			wcs = 0;
+			s = 0;
 			alloc = !!dest;
 			p++;
 		} else {