From e79504236548e4c909959ba444f87a12224555ac Mon Sep 17 00:00:00 2001 From: Sudip Mukherjee Date: Wed, 23 Sep 2015 19:02:32 +0530 Subject: [PATCH] lpfc: fix memory leak and NULL dereference kmalloc() can return NULL and without checking we were dereferencing it. Moreover if kmalloc succeeds but the function fails in other parts then we were returning the error code but we missed freeing lcb_context. While at it fixed one related checkpatch warning. Signed-off-by: Sudip Mukherjee Reviewed-by: James Smart Signed-off-by: James Bottomley --- drivers/scsi/lpfc/lpfc_els.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c index 3feeb447b740..b6fa257ea3e0 100644 --- a/drivers/scsi/lpfc/lpfc_els.c +++ b/drivers/scsi/lpfc/lpfc_els.c @@ -5173,7 +5173,6 @@ lpfc_els_rcv_lcb(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb, rjt_err = LSRJT_CMD_UNSUPPORTED; goto rjt; } - lcb_context = kmalloc(sizeof(struct lpfc_lcb_context), GFP_KERNEL); if (phba->hba_flag & HBA_FCOE_MODE) { rjt_err = LSRJT_CMD_UNSUPPORTED; @@ -5204,6 +5203,12 @@ lpfc_els_rcv_lcb(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb, goto rjt; } + lcb_context = kmalloc(sizeof(*lcb_context), GFP_KERNEL); + if (!lcb_context) { + rjt_err = LSRJT_UNABLE_TPC; + goto rjt; + } + state = (beacon->lcb_sub_command == LPFC_LCB_ON) ? 1 : 0; lcb_context->sub_command = beacon->lcb_sub_command; lcb_context->type = beacon->lcb_type; @@ -5214,6 +5219,7 @@ lpfc_els_rcv_lcb(struct lpfc_vport *vport, struct lpfc_iocbq *cmdiocb, if (lpfc_sli4_set_beacon(vport, lcb_context, state)) { lpfc_printf_vlog(ndlp->vport, KERN_ERR, LOG_ELS, "0193 failed to send mail box"); + kfree(lcb_context); lpfc_nlp_put(ndlp); rjt_err = LSRJT_UNABLE_TPC; goto rjt; -- 2.20.1