mtd: Fix warning in access_ok() parameter passing

[sfrench/cifs-2.6.git] / drivers / mtd / mtdchar.c

diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 7d4e7b9da3a1aceef2ea5ea664cea4e0d94752c6..a0f54e80670cc85bda232a4cd1a00d14c9c47a6f 100644 (file)
--- 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);