Re: [PATCH 1/2] staging: binder: add __user annotation in binder.c

[Joe Perches]

On Tue, 2014-03-25 at 01:24 +0100, Mathieu Maret wrote:
> Fix the following spare warning

sparse

> drivers/staging/android/binder.c:2691:21: warning: incorrect type in argument 
> 1 (different address spaces)
[]
> diff --git a/drivers/staging/android/binder.c 
> b/drivers/staging/android/binder.c
[]
> @@ -2688,7 +2688,7 @@ static long binder_ioctl(struct file *filp, unsigned 
> int cmd, unsigned long arg)
[]
> -             if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct 
> binder_version *)ubuf)->protocol_version)) {
> +             if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct 
> binder_version __user *)ubuf)->protocol_version)) {

That's certainly one way to do it, but I'd suggest
using a temporary instead

 drivers/staging/android/binder.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c
index cfe4bc8..1f5e249 100644
--- a/drivers/staging/android/binder.c
+++ b/drivers/staging/android/binder.c
@@ -2683,16 +2683,20 @@ static long binder_ioctl(struct file *filp, unsigned 
int cmd, unsigned long arg)
                binder_free_thread(proc, thread);
                thread = NULL;
                break;
-       case BINDER_VERSION:
+       case BINDER_VERSION: {
+               struct binder_version __user *ver = ubuf;
+
                if (size != sizeof(struct binder_version)) {
                        ret = -EINVAL;
                        goto err;
                }
-               if (put_user(BINDER_CURRENT_PROTOCOL_VERSION, &((struct 
binder_version *)ubuf)->protocol_version)) {
+               if (put_user(BINDER_CURRENT_PROTOCOL_VERSION,
+                            &ver->protocol_version)) {
                        ret = -EINVAL;
                        goto err;
                }
                break;
+       }
        default:
                ret = -EINVAL;
                goto err;


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