linux-kernel - [PATCH] liquidio: Replace vmalloc_node + memset with vzalloc_node and use array

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Date:   Mon, 15 Jun 2020 16:18:55 -0500
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     Derek Chickles <dchickles@...vell.com>,
        Satanand Burla <sburla@...vell.com>,
        Felix Manlunas <fmanlunas@...vell.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH] liquidio: Replace vmalloc_node + memset with vzalloc_node
 and use array_size

Use vzalloc/vzalloc_node instead of the vmalloc/vzalloc_node and memset.

Also, notice that vzalloc_node() function has no 2-factor argument form
to calculate the size for the allocation, so multiplication factors need
to be wrapped in array_size().

This issue was found with the help of Coccinelle and, audited and fixed
manually.

Addresses-KSPP-ID: https://github.com/KSPP/linux/issues/83
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/net/ethernet/cavium/liquidio/request_manager.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/cavium/liquidio/request_manager.c b/drivers/net/ethernet/cavium/liquidio/request_manager.c
index 6dd65f9b347c..8e59c2825533 100644
--- a/drivers/net/ethernet/cavium/liquidio/request_manager.c
+++ b/drivers/net/ethernet/cavium/liquidio/request_manager.c
@@ -95,12 +95,10 @@ int octeon_init_instr_queue(struct octeon_device *oct,
 	/* Initialize a list to holds requests that have been posted to Octeon
 	 * but has yet to be fetched by octeon
 	 */
-	iq->request_list = vmalloc_node((sizeof(*iq->request_list) * num_descs),
-					       numa_node);
+	iq->request_list = vzalloc_node(array_size(num_descs, sizeof(*iq->request_list)),
+					numa_node);
 	if (!iq->request_list)
-		iq->request_list =
-			vmalloc(array_size(num_descs,
-					   sizeof(*iq->request_list)));
+		iq->request_list = vzalloc(array_size(num_descs, sizeof(*iq->request_list)));
 	if (!iq->request_list) {
 		lio_dma_free(oct, q_size, iq->base_addr, iq->base_addr_dma);
 		dev_err(&oct->pci_dev->dev, "Alloc failed for IQ[%d] nr free list\n",
@@ -108,8 +106,6 @@ int octeon_init_instr_queue(struct octeon_device *oct,
 		return 1;
 	}
 
-	memset(iq->request_list, 0, sizeof(*iq->request_list) * num_descs);
-
 	dev_dbg(&oct->pci_dev->dev, "IQ[%d]: base: %p basedma: %pad count: %d\n",
 		iq_no, iq->base_addr, &iq->base_addr_dma, iq->max_count);
 
-- 
2.27.0