From: James Smart jsmart2021@gmail.com
[ Upstream commit 6c6d59e0fe5b86cf273d6d744a6a9768c4ecc756 ]
Coverity reported the following:
*** CID 101747: Null pointer dereferences (FORWARD_NULL) /drivers/scsi/lpfc/lpfc_els.c: 4439 in lpfc_cmpl_els_rsp() 4433 kfree(mp); 4434 } 4435 mempool_free(mbox, phba->mbox_mem_pool); 4436 } 4437 out: 4438 if (ndlp && NLP_CHK_NODE_ACT(ndlp)) { vvv CID 101747: Null pointer dereferences (FORWARD_NULL) vvv Dereferencing null pointer "shost". 4439 spin_lock_irq(shost->host_lock); 4440 ndlp->nlp_flag &= ~(NLP_ACC_REGLOGIN | NLP_RM_DFLT_RPI); 4441 spin_unlock_irq(shost->host_lock); 4442 4443 /* If the node is not being used by another discovery thread, 4444 * and we are sending a reject, we are done with it.
Fix by adding a check for non-null shost in line 4438. The scenario when shost is set to null is when ndlp is null. As such, the ndlp check present was sufficient. But better safe than sorry so add the shost check.
Reported-by: coverity-bot keescook+coverity-bot@chromium.org Addresses-Coverity-ID: 101747 ("Null pointer dereferences") Fixes: 2e0fef85e098 ("[SCSI] lpfc: NPIV: split ports")
CC: James Bottomley James.Bottomley@SteelEye.com CC: "Gustavo A. R. Silva" gustavo@embeddedor.com CC: linux-next@vger.kernel.org Link: https://lore.kernel.org/r/20191111230401.12958-3-jsmart2021@gmail.com Reviewed-by: Ewan D. Milne emilne@redhat.com Signed-off-by: Dick Kennedy dick.kennedy@broadcom.com Signed-off-by: James Smart jsmart2021@gmail.com Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/scsi/lpfc/lpfc_els.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c index 7ca8c2522c928..530b7df21322a 100644 --- a/drivers/scsi/lpfc/lpfc_els.c +++ b/drivers/scsi/lpfc/lpfc_els.c @@ -3839,7 +3839,7 @@ lpfc_cmpl_els_rsp(struct lpfc_hba *phba, struct lpfc_iocbq *cmdiocb, mempool_free(mbox, phba->mbox_mem_pool); } out: - if (ndlp && NLP_CHK_NODE_ACT(ndlp)) { + if (ndlp && NLP_CHK_NODE_ACT(ndlp) && shost) { spin_lock_irq(shost->host_lock); ndlp->nlp_flag &= ~(NLP_ACC_REGLOGIN | NLP_RM_DFLT_RPI); spin_unlock_irq(shost->host_lock);