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md/raid10: fix bug when raid10 recovery fails to recover a block. 

commit e875ecea26
    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: e875ecea26
Reported-by: Damian Nowak <spam@nowaker.net>
URL: https://bugzilla.kernel.org/show_bug.cgi?id=68181
Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2014-01-06 10:35:34 +11:00
parent 5af9bef72c
commit e8b8491585
1 changed files with 4 additions and 4 deletions
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8
drivers/md/raid10.c
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@ -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;
}
}