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Diffstat (limited to 'ext/openssl/ossl_cipher.c')
-rw-r--r--ext/openssl/ossl_cipher.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/ext/openssl/ossl_cipher.c b/ext/openssl/ossl_cipher.c
index cb5fee6aeeb..221588fdb9a 100644
--- a/ext/openssl/ossl_cipher.c
+++ b/ext/openssl/ossl_cipher.c
@@ -224,7 +224,8 @@ ossl_cipher_update(VALUE self, VALUE data)
StringValue(data);
in = RSTRING(data)->ptr;
- in_len = RSTRING(data)->len;
+ if ((in_len = RSTRING(data)->len) == 0)
+ rb_raise(rb_eArgError, "data must not be empty");
GetCipher(self, ctx);
str = rb_str_new(0, in_len+EVP_CIPHER_CTX_block_size(ctx));
if (!EVP_CipherUpdate(ctx, RSTRING(str)->ptr, &out_len, in, in_len))