Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.10 17/23] md/raid10: fix bug when raid10 recovery fails to recover a block. | Date | Thu, 23 Jan 2014 10:39:50 -0800 |
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3.10-stable review patch. If anyone has any objections, please let me know.
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From: NeilBrown <neilb@suse.de>
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>
--- drivers/md/raid10.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/md/raid10.c +++ b/drivers/md/raid10.c @@ -3198,10 +3198,6 @@ static sector_t sync_request(struct mdde 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) @@ -3233,6 +3229,10 @@ static sector_t sync_request(struct mdde mirror->recovery_disabled = mddev->recovery_disabled; } + put_buf(r10_bio); + if (rb2) + atomic_dec(&rb2->remaining); + r10_bio = rb2; break; } }
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