fs-verity: use u64_to_user_ptr()

<linux/kernel.h> already provides a macro u64_to_user_ptr().
Use it instead of open-coding the two casts.

No change in behavior.

Link: https://lore.kernel.org/r/20191231175408.20524-1-ebiggers@kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>

diff --git a/fs/verity/enable.c b/fs/verity/enable.c
index f8535732905f0296231344d7ab6a3c046bbea171..d98bea308fd7f1bc234764c689116d9ffb27b25a 100644 (file)
--- a/fs/verity/enable.c
+++ b/fs/verity/enable.c
@@ -216,8 +216,7 @@ static int enable_verity(struct file *filp,
 
        /* Get the salt if the user provided one */
        if (arg->salt_size &&
-           copy_from_user(desc->salt,
-                          (const u8 __user *)(uintptr_t)arg->salt_ptr,
+           copy_from_user(desc->salt, u64_to_user_ptr(arg->salt_ptr),
                           arg->salt_size)) {
                err = -EFAULT;
                goto out;
@@ -226,8 +225,7 @@ static int enable_verity(struct file *filp,
 
        /* Get the signature if the user provided one */
        if (arg->sig_size &&
-           copy_from_user(desc->signature,
-                          (const u8 __user *)(uintptr_t)arg->sig_ptr,
+           copy_from_user(desc->signature, u64_to_user_ptr(arg->sig_ptr),
                           arg->sig_size)) {
                err = -EFAULT;
                goto out;