Patch "scsi: lpfc: Fix memory leak on lpfc_bsg_write_ebuf_set func" has been added to the 5.4-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    scsi: lpfc: Fix memory leak on lpfc_bsg_write_ebuf_set func

to the 5.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     scsi-lpfc-fix-memory-leak-on-lpfc_bsg_write_ebuf_set.patch
and it can be found in the queue-5.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 633706a509d6b4104f32d13d7e04daa00d7dc269
Author: Bo Wu <wubo40@xxxxxxxxxx>
Date:   Sat Dec 7 03:22:46 2019 +0000

    scsi: lpfc: Fix memory leak on lpfc_bsg_write_ebuf_set func
    
    [ Upstream commit 9a1b0b9a6dab452fb0e39fe96880c4faf3878369 ]
    
    When phba->mbox_ext_buf_ctx.seqNum != phba->mbox_ext_buf_ctx.numBuf,
    dd_data should be freed before return SLI_CONFIG_HANDLED.
    
    When lpfc_sli_issue_mbox func return fails, pmboxq should be also freed in
    job_error tag.
    
    Link: https://lore.kernel.org/r/EDBAAA0BBBA2AC4E9C8B6B81DEEE1D6915E7A966@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
    Signed-off-by: Bo Wu <wubo40@xxxxxxxxxx>
    Reviewed-by: Zhiqiang Liu <liuzhiqiang26@xxxxxxxxxx>
    Reviewed-by: James Smart <james.smart@xxxxxxxxxxxx>
    Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/scsi/lpfc/lpfc_bsg.c b/drivers/scsi/lpfc/lpfc_bsg.c
index 39a736b887b1..6c2b03415a2c 100644
--- a/drivers/scsi/lpfc/lpfc_bsg.c
+++ b/drivers/scsi/lpfc/lpfc_bsg.c
@@ -4489,12 +4489,6 @@ lpfc_bsg_write_ebuf_set(struct lpfc_hba *phba, struct bsg_job *job,
 	phba->mbox_ext_buf_ctx.seqNum++;
 	nemb_tp = phba->mbox_ext_buf_ctx.nembType;
 
-	dd_data = kmalloc(sizeof(struct bsg_job_data), GFP_KERNEL);
-	if (!dd_data) {
-		rc = -ENOMEM;
-		goto job_error;
-	}
-
 	pbuf = (uint8_t *)dmabuf->virt;
 	size = job->request_payload.payload_len;
 	sg_copy_to_buffer(job->request_payload.sg_list,
@@ -4531,6 +4525,13 @@ lpfc_bsg_write_ebuf_set(struct lpfc_hba *phba, struct bsg_job *job,
 				"2968 SLI_CONFIG ext-buffer wr all %d "
 				"ebuffers received\n",
 				phba->mbox_ext_buf_ctx.numBuf);
+
+		dd_data = kmalloc(sizeof(struct bsg_job_data), GFP_KERNEL);
+		if (!dd_data) {
+			rc = -ENOMEM;
+			goto job_error;
+		}
+
 		/* mailbox command structure for base driver */
 		pmboxq = mempool_alloc(phba->mbox_mem_pool, GFP_KERNEL);
 		if (!pmboxq) {
@@ -4579,6 +4580,8 @@ lpfc_bsg_write_ebuf_set(struct lpfc_hba *phba, struct bsg_job *job,
 	return SLI_CONFIG_HANDLED;
 
 job_error:
+	if (pmboxq)
+		mempool_free(pmboxq, phba->mbox_mem_pool);
 	lpfc_bsg_dma_page_free(phba, dmabuf);
 	kfree(dd_data);