[PATCH] md: Handle overflow of mdu_array_info_t->size better

mdu_array_info_t->size is 'int', which isn't big enough for the size (in KB of
each component in) some arrays.

So rather than a random overflow, set size to -1 when it cannot be set
correctly.

To update aspect on an array, userspace will sometimes:
  get_array_info
  change one field
  set_array_info

in this case, we don't want the '-1' in 'size' to change to size, or look like
a size change at all.  So test for that in update_array_info.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/md/md.c b/drivers/md/md.c
index 653d4dcbee23..8f161743e18f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -2942,6 +2942,8 @@ static int get_array_info(mddev_t * mddev, void __user * arg)
         info.ctime         = mddev->ctime;
         info.level         = mddev->level;
         info.size          = mddev->size;
+        if (info.size != mddev->size) /* overflow */
+                info.size = -1;
         info.nr_disks      = nr;
         info.raid_disks    = mddev->raid_disks;
         info.md_minor      = mddev->md_minor;
@@ -3523,7 +3525,7 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
                 )
                 return -EINVAL;
         /* Check there is only one change */
-        if (mddev->size != info->size) cnt++;
+        if (info->size >= 0 && mddev->size != info->size) cnt++;
         if (mddev->raid_disks != info->raid_disks) cnt++;
         if (mddev->layout != info->layout) cnt++;
         if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
@@ -3540,7 +3542,7 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
                 else
                         return mddev->pers->reconfig(mddev, info->layout, -1);
         }
-        if (mddev->size != info->size)
+        if (info->size >= 0 && mddev->size != info->size)
                 rv = update_size(mddev, info->size);
 
         if (mddev->raid_disks    != info->raid_disks)