[SCSI] sg: convert to kstrtoul_from_user()

Instead of open coding this function use kstrtoul_from_user() directly.

Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Douglas Gilbert <dgilbert@interlog.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 02d99982a74d9048edfb73359ed2e38d08b163f8..eacd46bb36b95fe2b5caf6e82f3940427a250910 100644 (file)
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -2368,16 +2368,15 @@ static ssize_t
 sg_proc_write_adio(struct file *filp, const char __user *buffer,
                   size_t count, loff_t *off)
 {
-       int num;
-       char buff[11];
+       int err;
+       unsigned long num;
 
        if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
                return -EACCES;
-       num = (count < 10) ? count : 10;
-       if (copy_from_user(buff, buffer, num))
-               return -EFAULT;
-       buff[num] = '\0';
-       sg_allow_dio = simple_strtoul(buff, NULL, 10) ? 1 : 0;
+       err = kstrtoul_from_user(buffer, count, 0, &num);
+       if (err)
+               return err;
+       sg_allow_dio = num ? 1 : 0;
        return count;
 }
 
@@ -2390,17 +2389,15 @@ static ssize_t
 sg_proc_write_dressz(struct file *filp, const char __user *buffer,
                     size_t count, loff_t *off)
 {
-       int num;
+       int err;
        unsigned long k = ULONG_MAX;
-       char buff[11];
 
        if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
                return -EACCES;
-       num = (count < 10) ? count : 10;
-       if (copy_from_user(buff, buffer, num))
-               return -EFAULT;
-       buff[num] = '\0';
-       k = simple_strtoul(buff, NULL, 10);
+
+       err = kstrtoul_from_user(buffer, count, 0, &k);
+       if (err)
+               return err;
        if (k <= 1048576) {     /* limit "big buff" to 1 MB */
                sg_big_buff = k;
                return count;