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-rw-r--r--stdlib/strfmon.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/stdlib/strfmon.c b/stdlib/strfmon.c
index 54771049ad..c956ae3040 100644
--- a/stdlib/strfmon.c
+++ b/stdlib/strfmon.c
@@ -170,6 +170,13 @@ __strfmon_l (char *s, size_t maxsize, __locale_t loc, const char *format, ...)
{
case '=': /* Set fill character. */
pad = *++fmt;
+ if (pad == '\0')
+ {
+ /* Premature EOS. */
+ __set_errno (EINVAL);
+ va_end (ap);
+ return -1;
+ }
continue;
case '^': /* Don't group digits. */
group = 0;