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scsi: lpfc: fix pci hot plug crash in list_add call
During pci hot plug, the kernel crashes in a list_add_call The lookup by tag function will return null if the IOCB is out of range or does not have the on txcmplq flag set. Fix: Check for null return from lookup by tag. Cc: <stable@vger.kernel.org> # 4.12+ Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <james.smart@broadcom.com> Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -12507,19 +12507,21 @@ lpfc_sli4_els_wcqe_to_rspiocbq(struct lpfc_hba *phba,
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/* Look up the ELS command IOCB and create pseudo response IOCB */
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cmdiocbq = lpfc_sli_iocbq_lookup_by_tag(phba, pring,
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bf_get(lpfc_wcqe_c_request_tag, wcqe));
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/* Put the iocb back on the txcmplq */
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lpfc_sli_ringtxcmpl_put(phba, pring, cmdiocbq);
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spin_unlock_irqrestore(&pring->ring_lock, iflags);
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if (unlikely(!cmdiocbq)) {
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spin_unlock_irqrestore(&pring->ring_lock, iflags);
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lpfc_printf_log(phba, KERN_WARNING, LOG_SLI,
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"0386 ELS complete with no corresponding "
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"cmdiocb: iotag (%d)\n",
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bf_get(lpfc_wcqe_c_request_tag, wcqe));
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"cmdiocb: 0x%x 0x%x 0x%x 0x%x\n",
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wcqe->word0, wcqe->total_data_placed,
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wcqe->parameter, wcqe->word3);
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lpfc_sli_release_iocbq(phba, irspiocbq);
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return NULL;
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}
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/* Put the iocb back on the txcmplq */
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lpfc_sli_ringtxcmpl_put(phba, pring, cmdiocbq);
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spin_unlock_irqrestore(&pring->ring_lock, iflags);
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/* Fake the irspiocbq and copy necessary response information */
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lpfc_sli4_iocb_param_transfer(phba, irspiocbq, cmdiocbq, wcqe);
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@ -17134,7 +17136,8 @@ exit:
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if (pcmd && pcmd->virt)
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dma_pool_free(phba->lpfc_drb_pool, pcmd->virt, pcmd->phys);
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kfree(pcmd);
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lpfc_sli_release_iocbq(phba, iocbq);
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if (iocbq)
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lpfc_sli_release_iocbq(phba, iocbq);
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lpfc_in_buf_free(phba, &dmabuf->dbuf);
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}
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