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-rw-r--r--ext/digest/digest.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/ext/digest/digest.c b/ext/digest/digest.c
index f56a1921f8f..63df4b126d1 100644
--- a/ext/digest/digest.c
+++ b/ext/digest/digest.c
@@ -45,7 +45,14 @@ hexdigest_str_new(const unsigned char *digest, size_t digest_len)
int i;
VALUE str;
char *p;
- static const char hex[] = "0123456789abcdef";
+ static const char hex[] = {
+ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
+ 'a', 'b', 'c', 'd', 'e', 'f'
+ };
+
+ if (LONG_MAX / 2 < digest_len) {
+ rb_raise(rb_eRuntimeError, "digest string too long");
+ }
str = rb_str_new(0, digest_len * 2);