open_istream(): do not dereference NULL in the error case

When stream-filter cannot be attached, it is expected to return NULL,
and we should close the stream we opened and signal an error by
returning NULL ourselves from this function.

However, we attempted to dereference that NULL pointer between the
point we detected the error and returned from the function.

Brought-to-attention-by: John Keeping <john@keeping.me.uk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/streaming.c b/streaming.c
index d7c9f32..2ff036a 100644 (file)
--- a/streaming.c
+++ b/streaming.c
@@ -152,8 +152,10 @@ struct git_istream *open_istream(const unsigned char *sha1,
        if (filter) {
                /* Add "&& !is_null_stream_filter(filter)" for performance */
                struct git_istream *nst = attach_stream_filter(st, filter);
-               if (!nst)
+               if (!nst) {
                        close_istream(st);
+                       return NULL;
+               }
                st = nst;
        }