mtd: Fix warning in access_ok() parameter passing

On m68k, where access_ok() doesn't cast the address parameter:

drivers/mtd/mtdchar.c: In function 'mtdchar_write_ioctl':
drivers/mtd/mtdchar.c:575:4: warning: passing argument 2 of 'access_ok' makes pointer from integer without a cast [enabled by default]
arch/m68k/include/asm/uaccess_mm.h:17:90: note: expected 'const void *' but argument is of type '__u64'
drivers/mtd/mtdchar.c:576:4: warning: passing argument 2 of 'access_ok' makes pointer from integer without a cast [enabled by default]
arch/m68k/include/asm/uaccess_mm.h:17:90: note: expected 'const void *' but argument is of type '__u64'

The address parameter of access_ok() is really a userspace pointer.
On most architectures, access_ok() is a macro that casts the address
parameter, hiding issues in its users.

Move around and use the existing usr_data and usr_oob temporary variables
to kill the warnings. Add a few "consts", and make more use of the
temporaries while we're at it.

Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

1 files changed, 11 insertions, 9 deletions

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 7d4e7b9da3a1..a0f54e80670c 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -568,13 +568,18 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
 {
         struct mtd_write_req req;
         struct mtd_oob_ops ops;
-        void __user *usr_data, *usr_oob;
+        const void __user *usr_data, *usr_oob;
         int ret;
 
-        if (copy_from_user(&req, argp, sizeof(req)) ||
-                        !access_ok(VERIFY_READ, req.usr_data, req.len) ||
-                        !access_ok(VERIFY_READ, req.usr_oob, req.ooblen))
+        if (copy_from_user(&req, argp, sizeof(req)))
                 return -EFAULT;
+
+        usr_data = (const void __user *)(uintptr_t)req.usr_data;
+        usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
+        if (!access_ok(VERIFY_READ, usr_data, req.len) ||
+            !access_ok(VERIFY_READ, usr_oob, req.ooblen))
+                return -EFAULT;
+
         if (!mtd->_write_oob)
                 return -EOPNOTSUPP;
 
@@ -583,10 +588,7 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
         ops.ooblen = (size_t)req.ooblen;
         ops.ooboffs = 0;
 
-        usr_data = (void __user *)(uintptr_t)req.usr_data;
-        usr_oob = (void __user *)(uintptr_t)req.usr_oob;
-
-        if (req.usr_data) {
+        if (usr_data) {
                 ops.datbuf = memdup_user(usr_data, ops.len);
                 if (IS_ERR(ops.datbuf))
                         return PTR_ERR(ops.datbuf);
@@ -594,7 +596,7 @@ static int mtdchar_write_ioctl(struct mtd_info *mtd,
                 ops.datbuf = NULL;
         }
 
-        if (req.usr_oob) {
+        if (usr_oob) {
                 ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
                 if (IS_ERR(ops.oobbuf)) {
                         kfree(ops.datbuf);