mdocml: mdoc_valid_post() may indirectly call roff_node_unlink() which

[schwarze@mdocml.bsd.lv]

Log Message:
-----------
mdoc_valid_post() may indirectly call roff_node_unlink() which may
set ROFF_NEXT_CHILD, which is desirable for the final call to
mdoc_valid_post() - in case the target itself gets deleted, the
parse point may need this adjustment - but not for the intermediate
calls - if intermediate nodes get deleted, that mustn't clobber the
parse point.  So move setting ROFF_NEXT_SIBLING to the proper place
in rew_last().

This fixes the assertion failure in jsg@'s afl test case 108/Apr27.

Modified Files:
--------------
    mdocml:
        mdoc_macro.c

Revision Data
-------------
Index: mdoc_macro.c
===================================================================
RCS file: /home/cvs/mdocml/mdocml/mdoc_macro.c,v
retrieving revision 1.199
retrieving revision 1.200
diff -Lmdoc_macro.c -Lmdoc_macro.c -u -p -r1.199 -r1.200
--- mdoc_macro.c
+++ mdoc_macro.c
@@ -263,7 +263,6 @@ rew_last(struct roff_man *mdoc, const st
 	if (to->flags & MDOC_VALID)
 		return;
 
-	mdoc->next = ROFF_NEXT_SIBLING;
 	while (mdoc->last != to) {
 		/*
 		 * Save the parent here, because we may delete the
@@ -276,6 +275,7 @@ rew_last(struct roff_man *mdoc, const st
 		mdoc->last = np;
 		assert(mdoc->last);
 	}
+	mdoc->next = ROFF_NEXT_SIBLING;
 	mdoc_valid_post(mdoc);
 }
 
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