diff options
| author | NeilBrown <neilb@suse.de> | 2014-01-06 10:35:34 +1100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-29 05:10:42 -0800 |
| commit | 511375d15b111abe2806aed91acb9a4f9d09b4cb (patch) | |
| tree | 6cba825e6607ad9f0aea6325b10155086157c38b | |
| parent | ddcb318f633ddd7354561fabfe6dd3c90ebbe4d5 (diff) | |
| download | lwn-511375d15b111abe2806aed91acb9a4f9d09b4cb.tar.gz lwn-511375d15b111abe2806aed91acb9a4f9d09b4cb.zip | |
md/raid10: fix bug when raid10 recovery fails to recover a block.
commit e8b849158508565e0cd6bc80061124afc5879160 upstream.
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.
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -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 99a102d186ce..c683271f0557 100644 --- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -2943,10 +2943,6 @@ 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) @@ -2978,6 +2974,10 @@ 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; } } |