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[SCSI] libiscsi: check that command ptr is set before accessing it

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If the scsi eh sends a TUR and the session is down we could
return SCSI_ML_HOST_BUSY. scsi eh will ignore this and send
ask us to abort the command and we blindly accesst the
command ptr.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2006-08-31 18:09:33 -04:00 committed by James Bottomley
parent ca5186842a
commit f47f2cf5d4
1 changed files with 22 additions and 5 deletions
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27
drivers/scsi/libiscsi.c
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@ -192,6 +192,8 @@ static void iscsi_complete_command(struct iscsi_cmd_task *ctask)
ctask->state = ISCSI_TASK_COMPLETED;
ctask->sc = NULL;
/* SCSI eh reuses commands to verify us */
sc->SCp.ptr = NULL;
list_del_init(&ctask->running);
__kfifo_put(session->cmdpool.queue, (void*)&ctask, sizeof(void*));
sc->scsi_done(sc);
@ -737,6 +739,7 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
sc->scsi_done = done;
sc->result = 0;
sc->SCp.ptr = NULL;
host = sc->device->host;
session = iscsi_hostdata(host->hostdata);
@ -801,9 +804,10 @@ int iscsi_queuecommand(struct scsi_cmnd *sc, void (*done)(struct scsi_cmnd *))
list_add_tail(&ctask->running, &conn->xmitqueue);
debug_scsi(
"ctask enq [%s cid %d sc %lx itt 0x%x len %d cmdsn %d win %d]\n",
"ctask enq [%s cid %d sc %p cdb 0x%x itt 0x%x len %d cmdsn %d "
"win %d]\n",
sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
conn->id, (long)sc, ctask->itt, sc->request_bufflen,
conn->id, sc, sc->cmnd[0], ctask->itt, sc->request_bufflen,
session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
spin_unlock(&session->lock);
@ -1134,11 +1138,24 @@ static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
int iscsi_eh_abort(struct scsi_cmnd *sc)
{
struct iscsi_cmd_task *ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
struct iscsi_conn *conn = ctask->conn;
struct iscsi_session *session = conn->session;
struct iscsi_cmd_task *ctask;
struct iscsi_conn *conn;
struct iscsi_session *session;
int rc;
/*
* if session was ISCSI_STATE_IN_RECOVERY then we may not have
* got the command.
*/
if (!sc->SCp.ptr) {
debug_scsi("sc never reached iscsi layer or it completed.\n");
return SUCCESS;
}
ctask = (struct iscsi_cmd_task *)sc->SCp.ptr;
conn = ctask->conn;
session = conn->session;
conn->eh_abort_cnt++;
debug_scsi("aborting [sc %p itt 0x%x]\n", sc, ctask->itt);