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scsi: qla2xxx: Fix crash on qla2x00_mailbox_command

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This patch fixes a crash on qla2x00_mailbox_command caused when the driver
is on UNLOADING state and tries to call qla2x00_poll, which triggers a
NULL pointer dereference.

Signed-off-by: Rodrigo R. Galvao <rosattig@linux.vnet.ibm.com>
Signed-off-by: Mauro S. M. Rodrigues <maurosr@linux.vnet.ibm.com>
Acked-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Rodrigo R. Galvao 2018-05-28 14:58:44 -03:00 committed by Martin K. Petersen
parent e73c864ba3
commit 3cb182b3fa
1 changed files with 8 additions and 0 deletions
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8
drivers/scsi/qla2xxx/qla_mbx.c
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@ -292,6 +292,14 @@ qla2x00_mailbox_command(scsi_qla_host_t *vha, mbx_cmd_t *mcp)
if (time_after(jiffies, wait_time))
break;
/*
* Check if it's UNLOADING, cause we cannot poll in
* this case, or else a NULL pointer dereference
* is triggered.
*/
if (unlikely(test_bit(UNLOADING, &base_vha->dpc_flags)))
return QLA_FUNCTION_TIMEOUT;
/* Check for pending interrupts. */
qla2x00_poll(ha->rsp_q_map[0]);