md/raid1: fix a use-after-free bug
Commit fd76863 (RAID1: a new I/O barrier implementation to remove resync
window) introduces a user-after-free bug.
Signed-off-by: Shaohua Li <shli@fb.com>
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index fefbbfd..2e5e480 100644
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -203,6 +203,7 @@ static void free_r1bio(struct r1bio *r1_bio)
static void put_buf(struct r1bio *r1_bio)
{
struct r1conf *conf = r1_bio->mddev->private;
+ sector_t sect = r1_bio->sector;
int i;
for (i = 0; i < conf->raid_disks * 2; i++) {
@@ -213,7 +214,7 @@ static void put_buf(struct r1bio *r1_bio)
mempool_free(r1_bio, conf->r1buf_pool);
- lower_barrier(conf, r1_bio->sector);
+ lower_barrier(conf, sect);
}
static void reschedule_retry(struct r1bio *r1_bio)