linux-kernel - [PATCH v2] RDMA/erdma: Use vcalloc() instead of vzalloc()

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Message-Id: <20250821072209.510348-1-rongqianfeng@vivo.com>
Date: Thu, 21 Aug 2025 15:22:09 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: Cheng Xu <chengyou@...ux.alibaba.com>,
	Kai Shen <kaishen@...ux.alibaba.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Leon Romanovsky <leon@...nel.org>,
	linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: Markus.Elfring@....de,
	Qianfeng Rong <rongqianfeng@...o.com>
Subject: [PATCH v2] RDMA/erdma: Use vcalloc() instead of vzalloc()

Replace vzalloc() with vcalloc() in vmalloc_to_dma_addrs().  As noted
in the kernel documentation [1], open-coded multiplication in allocator
arguments is discouraged because it can lead to integer overflow.

Use vcalloc() to gain built-in overflow protection, making memory
allocation safer when calculating allocation size compared to explicit
multiplication.

[1]: https://www.kernel.org/doc/html/next/process/deprecated.html#open-coded-arithmetic-in-allocator-arguments

Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
---
v2: change sizeof(dma_addr_t) to sizeof(*pg_dma) to improve code
    robustness as suggested by Markus.
---
 drivers/infiniband/hw/erdma/erdma_verbs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/infiniband/hw/erdma/erdma_verbs.c b/drivers/infiniband/hw/erdma/erdma_verbs.c
index 996860f49b2f..109a3f3de911 100644
--- a/drivers/infiniband/hw/erdma/erdma_verbs.c
+++ b/drivers/infiniband/hw/erdma/erdma_verbs.c
@@ -671,7 +671,7 @@ static u32 vmalloc_to_dma_addrs(struct erdma_dev *dev, dma_addr_t **dma_addrs,
 
 	npages = (PAGE_ALIGN((u64)buf + len) - PAGE_ALIGN_DOWN((u64)buf)) >>
 		 PAGE_SHIFT;
-	pg_dma = vzalloc(npages * sizeof(dma_addr_t));
+	pg_dma = vcalloc(npages, sizeof(*pg_dma));
 	if (!pg_dma)
 		return 0;
 
-- 
2.34.1