commit 5a8b373cd01671285df647379299fbc5f49707c1
from: Stefan Sperling <stsp@stsp.name>
date: Fri Dec 18 15:55:18 2020 UTC

fix parsing of tag objects which lack a tag message

This problem could be triggered with the u-boot repository:

$ git clone --bare https://gitlab.denx.de/u-boot/u-boot.git
$ got log -r u-boot.git
got-read-pack: bad object data
got: bad object data
$

commit - e8bfb8f3994fa8096bf56db895d969b4961f8b4b
commit + 5a8b373cd01671285df647379299fbc5f49707c1
blob - 87a2ed47fc53ce199f828d6f49ba4cd304e3b52f
blob + 241ea3c3ccac1133d50d95329813ab14c3d00f3d
--- lib/object_parse.c
+++ lib/object_parse.c
@@ -925,7 +925,7 @@ got_object_parse_tag(struct got_tag_object **tag, uint
 		}
 		s += slen + 1;
 		remain -= slen + 1;
-		if (remain <= 0) {
+		if (remain < 0) {
 			err = got_error(GOT_ERR_BAD_OBJ_DATA);
 			goto done;
 		}