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RDMA/erdma: Use vcalloc() instead of vzalloc()

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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

Link: https://patch.msgid.link/r/20250821072209.510348-1-rongqianfeng@vivo.com
Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.com>
Reviewed-by: Cheng Xu <chengyou@linux.alibaba.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Qianfeng Rong 2025-08-21 15:22:09 +08:00 committed by Jason Gunthorpe
parent 08aae78604
commit 2aa35b24ad
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/hw/erdma/erdma_verbs.c
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@ -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;