b58check: Check binsz is long enough for checksum

2014-08-18 14:51:58 +00:00
parent 948c869356
commit 4774e2c59f
1 changed files with 2 additions and 0 deletions
--- a/base58.c
+++ b/base58.c
@@ -94,6 +94,8 @@ int _blkmk_b58check(void *bin, size_t binsz, const char *base58str) {
 	unsigned char buf[32];
 	unsigned char *binc = bin;
 	unsigned i;
+	if (binsz < 4)
+		return -4;
 	if (!_blkmk_dblsha256(buf, bin, binsz - 4))
 		return -2;
 	if (memcmp(&binc[binsz - 4], buf, 4))