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blk-throttle: fix potential NULL pointer dereference in throtl_select_dispatch 

tg in throtl_select_dispatch is used first and then do check. Since tg
may be NULL, it has potential NULL pointer dereference risk. So fix
it.

Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Liu Bo <bo.liu@linux.alibaba.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Liu Bo 2018-05-29 16:29:12 +08:00 committed by Jens Axboe
parent a6088845c2
commit 2ab74cd296
1 changed files with 2 additions and 1 deletions
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3
block/blk-throttle.c
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@ -1207,7 +1207,7 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq)
while (1) { while (1) {
struct throtl_grp *tg = throtl_rb_first(parent_sq); struct throtl_grp *tg = throtl_rb_first(parent_sq);
struct throtl_service_queue *sq = &tg->service_queue; struct throtl_service_queue *sq;
if (!tg) if (!tg)
break; break;
@ -1219,6 +1219,7 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq)
nr_disp += throtl_dispatch_tg(tg); nr_disp += throtl_dispatch_tg(tg);
sq = &tg->service_queue;
if (sq->nr_queued[0] || sq->nr_queued[1]) if (sq->nr_queued[0] || sq->nr_queued[1])
tg_update_disptime(tg); tg_update_disptime(tg);