# HG changeset patch
# User Boris Feld <boris.feld@octobus.net>
# Date 1546182666 -3600
# Node ID 7542466b94e25ec658e64bd3d33105a59bebc53e
# Parent  f4113489e4d493ffb0aa6c3c58454dc7e3b82e83
revlog: cache delta base value under -1

Such base are invalid so we better report them early.

diff -r f4113489e4d4 -r 7542466b94e2 mercurial/cext/revlog.c
--- a/mercurial/cext/revlog.c	Thu Dec 27 23:34:37 2018 +0100
+++ b/mercurial/cext/revlog.c	Sun Dec 30 16:11:06 2018 +0100
@@ -863,6 +863,13 @@
 		    rev, result);
 		return -2;
 	}
+	if (result < -1) {
+		PyErr_Format(
+		    PyExc_ValueError,
+		    "corrupted revlog, revision base out of range: %d, %d",
+		    rev, result);
+		return -2;
+	}
 	return result;
 }