dpt_i2o: Fix up copy*user

Signed-off-by: Alan Cox <alan@linux.intel.com>
Cc: stable@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/scsi/dpt_i2o.c b/drivers/scsi/dpt_i2o.c
index b6af63ca980b..7d1aac31ec8d 100644
--- a/drivers/scsi/dpt_i2o.c
+++ b/drivers/scsi/dpt_i2o.c
@@ -1918,6 +1918,10 @@ static int adpt_i2o_passthru(adpt_hba* pHba, u32 __user *arg)
                 }
                 size = size>>16;
                 size *= 4;
+                if (size > MAX_MESSAGE_SIZE) {
+                        rcode = EINVAL;
+                        goto cleanup;
+                }
                 /* Copy in the user's I2O command */
                 if (copy_from_user (msg, user_msg, size)) {
                         rcode = -EFAULT;