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-rw-r--r--strftime.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/strftime.c b/strftime.c
index 69ed924325..1164db01d1 100644
--- a/strftime.c
+++ b/strftime.c
@@ -210,7 +210,7 @@ rb_strftime_with_timespec(char *s, size_t maxsize, const char *format, const str
if (precision > 0 || flags & (BIT_OF(LOCALE_E)|BIT_OF(LOCALE_O))) \
goto unknown; \
} while (0)
-#define NEEDS(n) do if (s + (n) >= endp - 1) goto err; while (0)
+#define NEEDS(n) do if (s >= endp || (n) >= endp - s - 1) goto err; while (0)
#define FILL_PADDING(i) do { \
if (!(flags & BIT_OF(LEFT)) && precision > (i)) { \
NEEDS(precision); \