linux-kernel - [PATCH 5.12 604/677] RDMA/i40iw: Fix error unwinding when i40iw_hmc_sd

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Date:   Wed, 12 May 2021 16:50:50 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Sindhu Devale <sindhu.devale@...el.com>,
        Shiraz Saleem <shiraz.saleem@...el.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 604/677] RDMA/i40iw: Fix error unwinding when i40iw_hmc_sd_one fails

From: Sindhu Devale <sindhu.devale@...el.com>

[ Upstream commit 783a11bf2400e5d5c42a943c3083dc0330751842 ]

When i40iw_hmc_sd_one fails, chunk is freed without the deletion of chunk
entry in the PBLE info list.

Fix it by adding the chunk entry to the PBLE info list only after
successful addition of SD in i40iw_hmc_sd_one.

This fixes a static checker warning reported here:
  https://lore.kernel.org/linux-rdma/YHV4CFXzqTm23AOZ@mwanda/

Fixes: 9715830157be ("i40iw: add pble resource files")
Link: https://lore.kernel.org/r/20210416002104.323-1-shiraz.saleem@intel.com
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Sindhu Devale <sindhu.devale@...el.com>
Signed-off-by: Shiraz Saleem <shiraz.saleem@...el.com>
Signed-off-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/infiniband/hw/i40iw/i40iw_pble.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/infiniband/hw/i40iw/i40iw_pble.c b/drivers/infiniband/hw/i40iw/i40iw_pble.c
index 53e5cd1a2bd6..146a4148219b 100644
--- a/drivers/infiniband/hw/i40iw/i40iw_pble.c
+++ b/drivers/infiniband/hw/i40iw/i40iw_pble.c
@@ -393,12 +393,9 @@ static enum i40iw_status_code add_pble_pool(struct i40iw_sc_dev *dev,
 	i40iw_debug(dev, I40IW_DEBUG_PBLE, "next_fpm_addr = %llx chunk_size[%u] = 0x%x\n",
 		    pble_rsrc->next_fpm_addr, chunk->size, chunk->size);
 	pble_rsrc->unallocated_pble -= (chunk->size >> 3);
-	list_add(&chunk->list, &pble_rsrc->pinfo.clist);
 	sd_reg_val = (sd_entry_type == I40IW_SD_TYPE_PAGED) ?
 			sd_entry->u.pd_table.pd_page_addr.pa : sd_entry->u.bp.addr.pa;
-	if (sd_entry->valid)
-		return 0;
-	if (dev->is_pf) {
+	if (dev->is_pf && !sd_entry->valid) {
 		ret_code = i40iw_hmc_sd_one(dev, hmc_info->hmc_fn_id,
 					    sd_reg_val, idx->sd_idx,
 					    sd_entry->entry_type, true);
@@ -409,6 +406,7 @@ static enum i40iw_status_code add_pble_pool(struct i40iw_sc_dev *dev,
 	}
 
 	sd_entry->valid = true;
+	list_add(&chunk->list, &pble_rsrc->pinfo.clist);
 	return 0;
  error:
 	kfree(chunk);
-- 
2.30.2