1 files changed, 7 insertions, 0 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index f43c88fa08cf..4a11abd9e70f 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2743,6 +2743,13 @@ void *vmap(struct page **pages, unsigned int count,
 
 	might_sleep();
 
+	/*
+	 * Your top guard is someone else's bottom guard. Not having a top
+	 * guard compromises someone else's mappings too.
+	 */
+	if (WARN_ON_ONCE(flags & VM_NO_GUARD))
+		flags &= ~VM_NO_GUARD;
+
 	if (count > totalram_pages())
 		return NULL;