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| author | Liu Bo <bo.liu@linux.alibaba.com> | 2018-05-29 10:29:12 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-05-30 18:54:33 +0200 |
| commit | 2ab74cd29622c48e9852d85618081c061b6ac6d9 (patch) | |
| tree | 16058bed4d103d7202f997b2d4e511a185e0c8e5 /block/blk-throttle.c | |
| parent | block: kyber: make kyber more friendly with merging (diff) | |
| download | linux-2ab74cd29622c48e9852d85618081c061b6ac6d9.tar.xz linux-2ab74cd29622c48e9852d85618081c061b6ac6d9.zip | |
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>
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index f63d88c92c3a..35bed770664d 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -1207,7 +1207,7 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq) while (1) { struct throtl_grp *tg = throtl_rb_first(parent_sq); - struct throtl_service_queue *sq = &tg->service_queue; + struct throtl_service_queue *sq; if (!tg) break; @@ -1219,6 +1219,7 @@ static int throtl_select_dispatch(struct throtl_service_queue *parent_sq) nr_disp += throtl_dispatch_tg(tg); + sq = &tg->service_queue; if (sq->nr_queued[0] || sq->nr_queued[1]) tg_update_disptime(tg); |