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block, bfq: don't dereference bic before null checking it 

The call to bfq_check_ioprio_change will dereference bic, however,
the null check for bic is after this call.  Move the the null
check on bic to before the call to avoid any potential null
pointer dereference issues.

Detected by CoverityScan, CID#1430138 ("Dereference before null check")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Colin Ian King 2017-04-20 15:07:18 +01:00 committed by Jens Axboe
parent 75ba4ada82
commit 8c9ff1adda
1 changed files with 2 additions and 2 deletions
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4
block/bfq-iosched.c
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@ -4401,11 +4401,11 @@ static int bfq_get_rq_private(struct request_queue *q, struct request *rq,
spin_lock_irq(&bfqd->lock);
bfq_check_ioprio_change(bic, bio);
if (!bic)
goto queue_fail;
bfq_check_ioprio_change(bic, bio);
bfq_bic_update_cgroup(bic, bio);
bfqq = bfq_get_bfqq_handle_split(bfqd, bic, bio, false, is_sync,