# HG changeset patch
# User Josef 'Jeff' Sipek <jeffpc@josefsipek.net>
# Date 1560375277 -10800
# Node ID 92fcaa2402192373f6a1be4cf89a431b5b0c69ad
# Parent  18a6543019cbe9fb5965de13fb2f389f2a63d1c5
base64: properly handle zero length input during decode

Without this explicit check we were accessing memory out-of-bounds (at index
-1).

Signed-off-by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net>

diff -r 18a6543019cb -r 92fcaa240219 base64.c
--- a/base64.c	Thu Jun 13 00:19:24 2019 +0300
+++ b/base64.c	Thu Jun 13 00:34:37 2019 +0300
@@ -186,6 +186,11 @@
 	size_t groups;
 	size_t i;
 
+	/* special case: empty input means empty output */
+	if (!inlen)
+		return 0;
+
+	/* must have full groups */
 	if (inlen % 4)
 		return -1;