[SCSI] megaraid_sas: fix for 32bit apps

It looks like this patch -

commit 7b2519afa1abd1b9f63aa1e90879307842422dae
Author: Yang, Bo <Bo.Yang@lsi.com>
Date:   Tue Oct 6 14:52:20 2009 -0600

    [SCSI] megaraid_sas: fix 64 bit sense pointer truncation

has caused a problem for 32bit programs with 64bit os -

http://bugzilla.kernel.org/show_bug.cgi?id=15001

fix by converting the user space 32bit pointer to a 64 bit one when
needed.

[jejb: fix up some 64 bit warnings]
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Cc: Bo Yang <Bo.Yang@lsi.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index 708ea31..d9b8ca5 100644 (file)
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -3781,6 +3781,7 @@ static int megasas_mgmt_compat_ioctl_fw(struct file *file, unsigned long arg)
            compat_alloc_user_space(sizeof(struct megasas_iocpacket));
        int i;
        int error = 0;
+       compat_uptr_t ptr;
 
        if (clear_user(ioc, sizeof(*ioc)))
                return -EFAULT;
@@ -3793,9 +3794,22 @@ static int megasas_mgmt_compat_ioctl_fw(struct file *file, unsigned long arg)
            copy_in_user(&ioc->sge_count, &cioc->sge_count, sizeof(u32)))
                return -EFAULT;
 
-       for (i = 0; i < MAX_IOCTL_SGE; i++) {
-               compat_uptr_t ptr;
+       /*
+        * The sense_ptr is used in megasas_mgmt_fw_ioctl only when
+        * sense_len is not null, so prepare the 64bit value under
+        * the same condition.
+        */
+       if (ioc->sense_len) {
+               void __user **sense_ioc_ptr =
+                       (void __user **)(ioc->frame.raw + ioc->sense_off);
+               compat_uptr_t *sense_cioc_ptr =
+                       (compat_uptr_t *)(cioc->frame.raw + cioc->sense_off);
+               if (get_user(ptr, sense_cioc_ptr) ||
+                   put_user(compat_ptr(ptr), sense_ioc_ptr))
+                       return -EFAULT;
+       }
 
+       for (i = 0; i < MAX_IOCTL_SGE; i++) {
                if (get_user(ptr, &cioc->sgl[i].iov_base) ||
                    put_user(compat_ptr(ptr), &ioc->sgl[i].iov_base) ||
                    copy_in_user(&ioc->sgl[i].iov_len,