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Btrfs: fix a out-of-bound access of raid_map 

We add the number of stripes on target devices into bbio->num_stripes
if we are under device replacement, and we just sort the raid_map of
those stripes that not on the target devices, so if when we need
real raid_map, we need skip the stripes on the target devices.

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
hifive-unleashed-5.1
Zhao Lei 2015-01-20 15:11:31 +08:00 committed by Chris Mason
parent df8d116ffa
commit e34c330d63
1 changed files with 5 additions and 2 deletions
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7
fs/btrfs/scrub.c
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@ -1299,7 +1299,9 @@ out:
static inline int scrub_nr_raid_mirrors(struct btrfs_bio *bbio, u64 *raid_map)
{
if (raid_map) {
if (raid_map[bbio->num_stripes - 1] == RAID6_Q_STRIPE)
int real_stripes = bbio->num_stripes - bbio->num_tgtdevs;
if (raid_map[real_stripes - 1] == RAID6_Q_STRIPE)
return 3;
else
return 2;
@ -1420,7 +1422,8 @@ leave_nomem:
scrub_stripe_index_and_offset(logical, raid_map,
mapped_length,
bbio->num_stripes,
bbio->num_stripes -
bbio->num_tgtdevs,
mirror_index,
&stripe_index,
&stripe_offset);