This is a note to let you know that I've just added the patch titled
md/raid10: fix bug when raid10 recovery fails to recover a block.
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
md-raid10-fix-bug-when-raid10-recovery-fails-to-recover-a-block.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From e8b849158508565e0cd6bc80061124afc5879160 Mon Sep 17 00:00:00 2001
From: NeilBrown <neilb@xxxxxxx>
Date: Mon, 6 Jan 2014 10:35:34 +1100
Subject: md/raid10: fix bug when raid10 recovery fails to recover a block.
From: NeilBrown <neilb@xxxxxxx>
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@xxxxxxxxxxx>
URL: https://bugzilla.kernel.org/show_bug.cgi?id=68181
Signed-off-by: NeilBrown <neilb@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/raid10.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -2943,10 +2943,6 @@ 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)
@@ -2978,6 +2974,10 @@ 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;
}
}
Patches currently in stable-queue which might be from neilb@xxxxxxx are
queue-3.4/md-raid10-fix-bug-when-raid10-recovery-fails-to-recover-a-block.patch
queue-3.4/md-raid5-fix-possible-confusion-when-multiple-write-errors-occur.patch
queue-3.4/md-raid10-fix-two-bugs-in-handling-of-known-bad-blocks.patch
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