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ublk: fix null-ptr-deref in ublk_queue_cmd #917

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ublk: fix null-ptr-deref in ublk_queue_cmd #917

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8 changes: 7 additions & 1 deletion drivers/block/ublk_drv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2090,8 +2090,14 @@ static void ublk_batch_queue_cmd(struct ublk_queue *ubq, struct request *rq, boo
static void ublk_queue_cmd(struct ublk_queue *ubq, struct request *rq)
{
struct io_uring_cmd *cmd = ubq->ios[rq->tag].cmd;
struct ublk_uring_cmd_pdu *pdu = ublk_get_uring_cmd_pdu(cmd);
struct ublk_uring_cmd_pdu *pdu;

if (unlikely(!cmd)) {
__ublk_abort_rq(ubq, rq);
return;
}

pdu = ublk_get_uring_cmd_pdu(cmd);
pdu->req = rq;
io_uring_cmd_complete_in_task(cmd, ublk_cmd_tw_cb);
}
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