open_istream(): do not dereference NULL in the error casejk/janitorial-fixes

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>

1 files changed, 3 insertions, 1 deletions

diff --git a/streaming.c b/streaming.c
index d7c9f32f0c..2ff036a0fa 100644
--- 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;
 	}