Subject: [PATCH 09/12] powerpc/uaccess: Cast away __user annotation after verification

From: Benjamin Gray <[email-masked]>
Date: Wed, 11 Oct 2023 16:37:08 +1100

Sparse reports dereference of a __user pointer. copy_mc_to_user() takes
a __user pointer, verifies it, then calls the generic copy routine
copy_mc_generic().

As we have verified the pointer, cast out the __user annotation when
passing to copy_mc_generic().

Signed-off-by: Benjamin Gray <[email-masked]>
---
 arch/powerpc/include/asm/uaccess.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index fb725ec77926..f1f9890f50d3 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -374,7 +374,7 @@ copy_mc_to_user(void __user *to, const void *from, unsigned long n)
 	if (check_copy_size(from, n, true)) {
 		if (access_ok(to, n)) {
 			allow_write_to_user(to, n);
-			n = copy_mc_generic((void *)to, from, n);
+			n = copy_mc_generic((void __force *)to, from, n);
 			prevent_write_to_user(to, n);
 		}
 	}
-- 
2.39.2