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lib9p: prevent files from being created in deleted directories (thanks BurnZeZ)

--- a/sys/src/lib9p/file.c

+++ b/sys/src/lib9p/file.c

@@ -191,6 +191,12 @@

 	}

 	wlock(fp);

+	if(fp->parent == nil){

+		wunlock(fp);

+		werrstr("create in deleted directory");

+		return nil;

+	}

+

 	/*

 	 * We might encounter blank spots along the

 	 * way due to deleted files that have not yet

-- 

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