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| author | NeilBrown <neilb@suse.de> | 2006-02-03 03:03:40 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-03 08:31:59 -0800 |
| commit | 284ae7cab0f7335c9e0aa8992b28415ef1a54c7c (patch) | |
| tree | bc74bef37ecdceed31a15b4aefd1defccecf4a40 /drivers/md/md.c | |
| parent | ab11f89929b785daaa428801bd8b7e65241d7913 (diff) | |
| download | lwn-284ae7cab0f7335c9e0aa8992b28415ef1a54c7c.tar.gz lwn-284ae7cab0f7335c9e0aa8992b28415ef1a54c7c.zip | |
[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>
Diffstat (limited to 'drivers/md/md.c')
| -rw-r--r-- | drivers/md/md.c | 6 |
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) |