1 files changed, 6 insertions, 0 deletions

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index c5c45de1a2ee..7cbbc7ab4b50 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -301,6 +301,12 @@ static int sg_ioctl_trans(unsigned int fd, unsigned int cmd,
         u32 data;
         void __user *dxferp;
         int err;
+        int interface_id;
+
+        if (get_user(interface_id, &sgio32->interface_id))
+                return -EFAULT;
+        if (interface_id != 'S')
+                return sys_ioctl(fd, cmd, (unsigned long)sgio32);
 
         if (get_user(iovec_count, &sgio32->iovec_count))
                 return -EFAULT;