[2.6.20.17 review 24/58] md: raid10: fix use-after-free of bio

Willy Tarreau
2007-08-22T08:59:54Z

[-- Attachment #1: 0024-md-raid10-fix-use-after-free-of-bio.patch --]
[-- Type: text/plain, Size: 1332 bytes --]

In case of read errors raid10d tries to print a nice error message,
unfortunately using data from an already put bio.

Signed-off-by: Maik Hampel <m.hampel@gmx.de>
Acked-By: NeilBrown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Willy Tarreau <w@1wt.eu>
---
drivers/md/raid10.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/md/raid10.c b/drivers/md/raid10.c
index fb5d9c6..e0029ea 100644
--- a/drivers/md/raid10.c
+++ b/drivers/md/raid10.c
@@ -1565,7 +1565,6 @@ static void raid10d(mddev_t *mddev)
bio = r10_bio->devs[r10_bio->read_slot].bio;
r10_bio->devs[r10_bio->read_slot].bio =
mddev->ro ? IO_BLOCKED : NULL;
- bio_put(bio);
mirror = read_balance(conf, r10_bio);
if (mirror == -1) {
printk(KERN_ALERT "raid10: %s: unrecoverable I/O"
@@ -1573,8 +1572,10 @@ static void raid10d(mddev_t *mddev)
bdevname(bio->bi_bdev,b),
(unsigned long long)r10_bio->sector);
raid_end_bio_io(r10_bio);
+ bio_put(bio);
} else {
const int do_sync = bio_sync(r10_bio->master_bio);
+ bio_put(bio);
rdev = conf->mirrors[mirror].rdev;
if (printk_ratelimit())
printk(KERN_ERR "raid10: %s: redirecting sector %llu to"
--
1.5.2.5

--