diff --git a/crypto/dso/dso_lib.c b/crypto/dso/dso_lib.c
index 8f185b38283cd..ec3c59ac4d222 100644
--- a/crypto/dso/dso_lib.c
+++ b/crypto/dso/dso_lib.c
@@ -324,6 +324,9 @@ DSO *DSO_dsobyaddr(void *addr, int flags)
     char *filename = NULL;
     int len = DSO_pathbyaddr(addr, NULL, 0);
 
+    if (len < 0)
+        return NULL;
+
     filename = OPENSSL_malloc(len);
     if (filename != NULL
             && DSO_pathbyaddr(addr, filename, len) == len)