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authorRich Felker <dalias@aerifal.cx>2013-08-31 22:47:44 -0400
committerRich Felker <dalias@aerifal.cx>2013-08-31 22:47:44 -0400
commitcbb8a6979038f96d3f67c659363cebf0615c42ba (patch)
tree54a4e0c3d862e3d52a2c2db30ca07be63afce7e4
parent35e8621a28db1c34685adbbf1c2229270cbf7236 (diff)
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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.
-rw-r--r--src/stdio/vfscanf.c2
1 files changed, 2 insertions, 0 deletions
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 {