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-rw-r--r--mm/gup.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/gup.c b/mm/gup.c
index 76fd199aaae2..b2b4d4263768 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -456,6 +456,13 @@ static int get_gate_page(struct mm_struct *mm, unsigned long address,
if ((gup_flags & FOLL_DUMP) || !is_zero_pfn(pte_pfn(*pte)))
goto unmap;
*page = pte_page(*pte);
+
+ /*
+ * This should never happen (a device public page in the gate
+ * area).
+ */
+ if (is_device_public_page(*page))
+ goto unmap;
}
get_page(*page);
out: