[S390] dasd: add proper compat pointer conversion for symmetrix ioctl

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index 5819dc02a143..1c500c462225 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -23,6 +23,7 @@
 #include <asm/debug.h>
 #include <asm/idals.h>
 #include <asm/ebcdic.h>
+#include <asm/compat.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
 #include <asm/cio.h>
@@ -2844,13 +2845,16 @@ static int dasd_symm_io(struct dasd_device *device, void __user *argp)
         rc = -EFAULT;
         if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
                 goto out;
-#ifndef CONFIG_64BIT
-        /* Make sure pointers are sane even on 31 bit. */
-        if ((usrparm.psf_data >> 32) != 0 || (usrparm.rssd_result >> 32) != 0) {
+        if (is_compat_task() || sizeof(long) == 4) {
+                /* Make sure pointers are sane even on 31 bit. */
                 rc = -EINVAL;
-                goto out;
+                if ((usrparm.psf_data >> 32) != 0)
+                        goto out;
+                if ((usrparm.rssd_result >> 32) != 0)
+                        goto out;
+                usrparm.psf_data &= 0x7fffffffULL;
+                usrparm.rssd_result &= 0x7fffffffULL;
         }
-#endif
         /* alloc I/O data area */
         psf_data = kzalloc(usrparm.psf_data_len, GFP_KERNEL | GFP_DMA);
         rssd_result = kzalloc(usrparm.rssd_result_len, GFP_KERNEL | GFP_DMA);