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| author | NeilBrown <neilb@suse.de> | 2014-01-06 10:35:34 +1100 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2014-01-14 16:44:08 +1100 |
| commit | e8b849158508565e0cd6bc80061124afc5879160 (patch) | |
| tree | 774d35e3f97ebc4f7a4b200c2f99f961afa7e1df | |
| parent | 5af9bef72c074dbe946da8b74eabd79cd5a9ff19 (diff) | |
| download | linux-e8b849158508565e0cd6bc80061124afc5879160.tar.gz linux-e8b849158508565e0cd6bc80061124afc5879160.tar.bz2 linux-e8b849158508565e0cd6bc80061124afc5879160.zip | |
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>
| -rw-r--r-- | drivers/md/raid10.c | 8 |
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; } } |