1 files changed, 5 insertions, 3 deletions
diff --git a/crypto/openssl/test/cmactest.c b/crypto/openssl/test/cmactest.c
index cb2b273b0f4f..72f7a0d9366b 100644
--- a/crypto/openssl/test/cmactest.c
+++ b/crypto/openssl/test/cmactest.c
@@ -196,13 +196,15 @@ err:
     return ret;
 }
 
+#define OSSL_HEX_CHARS_PER_BYTE 2
 static char *pt(unsigned char *md, unsigned int len)
 {
     unsigned int i;
-    static char buf[80];
+    static char buf[81];
 
-    for (i = 0; i < len; i++)
-        sprintf(&(buf[i * 2]), "%02x", md[i]);
+    for (i = 0; i < len && (i + 1) * OSSL_HEX_CHARS_PER_BYTE < sizeof(buf); i++)
+        BIO_snprintf(buf + i * OSSL_HEX_CHARS_PER_BYTE,
+                     OSSL_HEX_CHARS_PER_BYTE + 1, "%02x", md[i]);
     return buf;
 }