[PATCH 2/2] Fix random sha1 in error message in http-fetch and http-push

[Mike Hommey <mh@glandium.org>]

When a downloaded ref doesn't contain a sha1, the error message displays
a random sha1 because of uninitialized memory. This happens when cloning
a repository that is already a clone of another one, in which case
refs/remotes/origin/HEAD is a symref.

Signed-off-by: Mike Hommey <mh@glandium.org>
---

Please note that this is already fixed in my strbuf patch for these files,
which had been applied in pu, but it seems to have disappeared from pu's
history. This also means the strbuf patch conflicts with this one. Please
tell me if you want a new strbuf patch made after this one.

 http-push.c   |    5 +++--
 http-walker.c |    5 +++--
 2 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/http-push.c b/http-push.c
index fc60bfd..7f1d043 100644
--- a/http-push.c
+++ b/http-push.c
@@ -1149,9 +1149,10 @@ int fetch_ref(char *ref, unsigned char *sha1)
 		return error("Unable to start request");
 	}
 
+	if (buffer.posn != 41)
+		return 1;
         hex[40] = '\0';
-        get_sha1_hex(hex, sha1);
-        return 0;
+        return get_sha1_hex(hex, sha1);
 }
 
 static void one_remote_object(const char *hex)
diff --git a/http-walker.c b/http-walker.c
index a3fb596..68b5108 100644
--- a/http-walker.c
+++ b/http-walker.c
@@ -986,9 +986,10 @@ static int fetch_ref(struct walker *walker, char *ref, unsigned char *sha1)
 		return error("Unable to start request");
 	}
 
+	if (buffer.posn != 41)
+		return 1;
         hex[40] = '\0';
-        get_sha1_hex(hex, sha1);
-        return 0;
+        return get_sha1_hex(hex, sha1);
 }
 
 static void cleanup(struct walker *walker)
-- 
1.5.4.rc0.8.gbf4af-dirty