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-rw-r--r--ext/date/date_strftime.c9
1 files changed, 7 insertions, 2 deletions
diff --git a/ext/date/date_strftime.c b/ext/date/date_strftime.c
index 20931a3..9d8167b 100644
--- a/ext/date/date_strftime.c
+++ b/ext/date/date_strftime.c
@@ -48,7 +48,7 @@ downcase(char *s, size_t i)
/* strftime --- produce formatted time */
static size_t
-date_strftime_with_tmx(char *s, size_t maxsize, const char *format,
+date_strftime_with_tmx(char *s, const size_t maxsize, const char *format,
const struct tmx *tmx)
{
char *endp = s + maxsize;
@@ -575,7 +575,12 @@ date_strftime_with_tmx(char *s, size_t maxsize, const char *format,
case '5': case '6': case '7': case '8': case '9':
{
char *e;
- precision = (int)strtoul(format, &e, 10);
+ unsigned long prec = strtoul(format, &e, 10);
+ if (prec > INT_MAX || prec > maxsize) {
+ errno = ERANGE;
+ return 0;
+ }
+ precision = (int)prec;
format = e - 1;
goto again;
}