[PATCH 4/4] make apply_to_page_range() more robust.

[mika.penttila]

From: Mika Penttilä <mika.pentt...@nextfour.com>


Now the arm/arm64 don't trigger this BUG_ON() any more,
but WARN_ON() is here enough to catch buggy callers
but still let potential other !size callers pass with warning.

Signed-off-by: Mika Penttilä mika.pentt...@nextfour.com

---
 mm/memory.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mm/memory.c b/mm/memory.c
index 30991f8..9178ee6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1871,7 +1871,9 @@ int apply_to_page_range(struct mm_struct *mm, unsigned 
long addr,
        unsigned long end = addr + size;
        int err;
 
-       BUG_ON(addr >= end);
+       if (WARN_ON(addr >= end))
+               return -EINVAL;
+
        pgd = pgd_offset(mm, addr);
        do {
                next = pgd_addr_end(addr, end);
-- 
1.9.1