[PATCH] alpha/kernel/traps: Use find_vma_intersection() in traps for setting si_code

[Liam Howlett <liam.howlett@oracle.com>]

find_vma() will continue to search upwards until the end of the virtual
memory space.  This means the si_code would almost never be set to
SEGV_MAPERR even when the address falls outside of any VMA.

Using find_vma_intersection() allows for what is intended by only
returning a VMA if it falls within the range provided, in this case a
window of 1.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---
 arch/alpha/kernel/traps.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/alpha/kernel/traps.c b/arch/alpha/kernel/traps.c
index 921d4b6e4d95..7f51386c06d0 100644
--- a/arch/alpha/kernel/traps.c
+++ b/arch/alpha/kernel/traps.c
@@ -957,8 +957,10 @@ do_entUnaUser(void __user * va, unsigned long opcode,
 		si_code = SEGV_ACCERR;
 	else {
 		struct mm_struct *mm = current->mm;
+		unsigned long addr = (unsigned long)va;
+
 		mmap_read_lock(mm);
-		if (find_vma(mm, (unsigned long)va))
+		if (find_vma_intersection(mm, addr, addr + 1))
 			si_code = SEGV_ACCERR;
 		else
 			si_code = SEGV_MAPERR;
-- 
2.30.0