megaraid_sas: Fix SMAP issue

Inside compat IOCTL hook of driver, driver was using wrong address of
ioc->frame.raw which leads sense_ioc_ptr to be calculated wrongly and
failing IOCTL.

Signed-off-by: Sumit Saxena <sumit.saxena@avagotech.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 3a3e7d0..e0b4ca1 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -6843,9 +6843,9 @@ static int megasas_mgmt_compat_ioctl_fw(struct file *file, unsigned long arg)
        int i;
        int error = 0;
        compat_uptr_t ptr;
-       unsigned long local_raw_ptr;
        u32 local_sense_off;
        u32 local_sense_len;
+       u32 user_sense_off;
 
        if (clear_user(ioc, sizeof(*ioc)))
                return -EFAULT;
@@ -6863,17 +6863,16 @@ static int megasas_mgmt_compat_ioctl_fw(struct file *file, unsigned long arg)
         * sense_len is not null, so prepare the 64bit value under
         * the same condition.
         */
-       if (get_user(local_raw_ptr, ioc->frame.raw) ||
-               get_user(local_sense_off, &ioc->sense_off) ||
-               get_user(local_sense_len, &ioc->sense_len))
+       if (get_user(local_sense_off, &ioc->sense_off) ||
+               get_user(local_sense_len, &ioc->sense_len) ||
+               get_user(user_sense_off, &cioc->sense_off))
                return -EFAULT;
 
-
        if (local_sense_len) {
                void __user **sense_ioc_ptr =
-                       (void __user **)((u8*)local_raw_ptr + local_sense_off);
+                       (void __user **)((u8 *)((unsigned long)&ioc->frame.raw) + local_sense_off);
                compat_uptr_t *sense_cioc_ptr =
-                       (compat_uptr_t *)(cioc->frame.raw + cioc->sense_off);
+                       (compat_uptr_t *)(((unsigned long)&cioc->frame.raw) + user_sense_off);
                if (get_user(ptr, sense_cioc_ptr) ||
                    put_user(compat_ptr(ptr), sense_ioc_ptr))
                        return -EFAULT;