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-   -   DM RAID: Fix off-by-one comparison. (http://www.linux-archive.org/device-mapper-development/561831-dm-raid-fix-off-one-comparison.html)

08-08-2011 07:29 PM

DM RAID: Fix off-by-one comparison.
 
Fix off-by-one comparison.

The user-supplied value given for the 'write_mostly' argument must be an
index starting at 0. The validation of the supplied argument failed to
check for 'N' ('>' vs '>='), which would have caused an access beyond the
end of the array.

Reported-by: Doug Ledford <dledford@redhat.com>
Signed-off-by: Jonathan Brassow <jbrassow@redhat.com>


Index: linux-upstream/drivers/md/dm-raid.c
================================================== =================
--- linux-upstream.orig/drivers/md/dm-raid.c
+++ linux-upstream/drivers/md/dm-raid.c
@@ -449,7 +449,7 @@ static int parse_raid_params(struct raid
rs->ti->error = "write_mostly option is only valid for RAID1";
return -EINVAL;
}
- if (value > rs->md.raid_disks) {
+ if (value >= rs->md.raid_disks) {
rs->ti->error = "Invalid write_mostly drive index given";
return -EINVAL;
}

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