fix double free bug

diff --git a/file.c b/file.c
index c92e60b..54003c1 100644 (file)
--- a/file.c
+++ b/file.c
@@ -75,6 +75,7 @@ static void uci_file_cleanup(struct uci_context *ctx)
 
        if (ctx->buf) {
                free(ctx->buf);
+               ctx->buf = NULL;
                ctx->bufsz = 0;
        }