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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>
This commit is contained in:
Dick Kennedy 2017-09-29 17:34:28 -07:00 committed by Martin K. Petersen
parent 1901762f2c
commit 401bb4169d
1 changed files with 10 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/scsi/lpfc/lpfc_sli.c
View File

@ -12507,19 +12507,21 @@ lpfc_sli4_els_wcqe_to_rspiocbq(struct lpfc_hba *phba,
/* Look up the ELS command IOCB and create pseudo response IOCB */
cmdiocbq = lpfc_sli_iocbq_lookup_by_tag(phba, pring,
bf_get(lpfc_wcqe_c_request_tag, wcqe));
/* Put the iocb back on the txcmplq */
lpfc_sli_ringtxcmpl_put(phba, pring, cmdiocbq);
spin_unlock_irqrestore(&pring->ring_lock, iflags);
if (unlikely(!cmdiocbq)) {
spin_unlock_irqrestore(&pring->ring_lock, iflags);
lpfc_printf_log(phba, KERN_WARNING, LOG_SLI,
"0386 ELS complete with no corresponding "
"cmdiocb: iotag (%d)\n",
bf_get(lpfc_wcqe_c_request_tag, wcqe));
"cmdiocb: 0x%x 0x%x 0x%x 0x%x\n",
wcqe->word0, wcqe->total_data_placed,
wcqe->parameter, wcqe->word3);
lpfc_sli_release_iocbq(phba, irspiocbq);
return NULL;
}
/* Put the iocb back on the txcmplq */
lpfc_sli_ringtxcmpl_put(phba, pring, cmdiocbq);
spin_unlock_irqrestore(&pring->ring_lock, iflags);
/* Fake the irspiocbq and copy necessary response information */
lpfc_sli4_iocb_param_transfer(phba, irspiocbq, cmdiocbq, wcqe);
@ -17134,7 +17136,8 @@ exit:
if (pcmd && pcmd->virt)
dma_pool_free(phba->lpfc_drb_pool, pcmd->virt, pcmd->phys);
kfree(pcmd);
lpfc_sli_release_iocbq(phba, iocbq);
if (iocbq)
lpfc_sli_release_iocbq(phba, iocbq);
lpfc_in_buf_free(phba, &dmabuf->dbuf);
}