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authorNeilBrown <neilb@suse.de>2014-01-06 03:35:34 +0400
committerNeilBrown <neilb@suse.de>2014-01-14 09:44:08 +0400
commite8b849158508565e0cd6bc80061124afc5879160 (patch)
tree774d35e3f97ebc4f7a4b200c2f99f961afa7e1df /drivers/md/raid10.c
parent5af9bef72c074dbe946da8b74eabd79cd5a9ff19 (diff)
downloadlinux-e8b849158508565e0cd6bc80061124afc5879160.tar.xz
md/raid10: fix bug when raid10 recovery fails to recover a block.
commit e875ecea266a543e643b19e44cf472f1412708f9 md/raid10 record bad blocks as needed during recovery. added code to the "cannot recover this block" path to record a bad block rather than fail the whole recovery. Unfortunately this new case was placed *after* r10bio was freed rather than *before*, yet it still uses r10bio. This is will crash with a null dereference. So move the freeing of r10bio down where it is safe. Cc: stable@vger.kernel.org (v3.1+) Fixes: e875ecea266a543e643b19e44cf472f1412708f9 Reported-by: Damian Nowak <spam@nowaker.net> URL: https://bugzilla.kernel.org/show_bug.cgi?id=68181 Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid10.c')
-rw-r--r--drivers/md/raid10.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index 65285211568f..06eeb99ea6fc 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -3218,10 +3218,6 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
if (j == conf->copies) {
/* Cannot recover, so abort the recovery or
* record a bad block */
- put_buf(r10_bio);
- if (rb2)
- atomic_dec(&rb2->remaining);
- r10_bio = rb2;
if (any_working) {
/* problem is that there are bad blocks
* on other device(s)
@@ -3253,6 +3249,10 @@ static sector_t sync_request(struct mddev *mddev, sector_t sector_nr,
mirror->recovery_disabled
= mddev->recovery_disabled;
}
+ put_buf(r10_bio);
+ if (rb2)
+ atomic_dec(&rb2->remaining);
+ r10_bio = rb2;
break;
}
}