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From: "Xu, Rosen" <rosen.xu@intel.com>
To: "Huang, Wei" <wei.huang@intel.com>, "dev@dpdk.org" <dev@dpdk.org>,
 "thomas@monjalon.net" <thomas@monjalon.net>, "nipun.gupta@nxp.com"
 <nipun.gupta@nxp.com>, "hemant.agrawal@nxp.com" <hemant.agrawal@nxp.com>
CC: "stable@dpdk.org" <stable@dpdk.org>, "Zhang, Tianfei"
 <tianfei.zhang@intel.com>, "Zhang, Qi Z" <qi.z.zhang@intel.com>
Subject: RE: [PATCH] raw/ifpga: avoid potential integer overflow
Thread-Topic: [PATCH] raw/ifpga: avoid potential integer overflow
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Date: Thu, 23 Jun 2022 06:35:58 +0000
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Errors-To: stable-bounces@dpdk.org

Hi,

> -----Original Message-----
> From: Huang, Wei <wei.huang@intel.com>
> Sent: Thursday, June 23, 2022 11:12
> To: dev@dpdk.org; thomas@monjalon.net; nipun.gupta@nxp.com;
> hemant.agrawal@nxp.com
> Cc: stable@dpdk.org; Xu, Rosen <rosen.xu@intel.com>; Zhang, Tianfei
> <tianfei.zhang@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>; Huang, Wei
> <wei.huang@intel.com>
> Subject: [PATCH] raw/ifpga: avoid potential integer overflow
>=20
> Expression "tx_chunks * ctx->dma_buf_size" in dma_fpga_to_fpga() is
> evaluated using 32-bit arithmetic, which would overflow  potentially. Cha=
nge
> tx_chunks to type "uint64_t" to avoid such issue.
>=20
> Coverity issue: 379203
> Fixes: 7d63899a5c19 ("raw/ifpga: add N3000 AFU driver")
>=20
> Signed-off-by: Wei Huang <wei.huang@intel.com>
> ---
>  drivers/raw/ifpga/afu_pmd_n3000.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>=20
> diff --git a/drivers/raw/ifpga/afu_pmd_n3000.c
> b/drivers/raw/ifpga/afu_pmd_n3000.c
> index 8708164..5120df5 100644
> --- a/drivers/raw/ifpga/afu_pmd_n3000.c
> +++ b/drivers/raw/ifpga/afu_pmd_n3000.c
> @@ -1158,7 +1158,7 @@ static int dma_fpga_to_fpga(struct dma_afu_ctx
> *ctx, uint64_t dst, uint64_t src,
>  	uint64_t count_left =3D count;
>  	uint64_t dma_chunks =3D 0;
>  	uint64_t offset =3D 0;
> -	uint32_t tx_chunks =3D 0;
> +	uint64_t tx_chunks =3D 0;
>  	uint64_t *tmp_buf =3D NULL;
>  	int ret =3D 0;
>=20
> @@ -1213,7 +1213,7 @@ static int dma_fpga_to_fpga(struct dma_afu_ctx
> *ctx, uint64_t dst, uint64_t src,
>  		offset =3D tx_chunks * ctx->dma_buf_size;
>  		count_left -=3D offset;
>  		IFPGA_RAWDEV_PMD_DEBUG("0x%"PRIx64" -->
> 0x%"PRIx64
> -			" (%u...0x%"PRIx64")",
> +			" (%"PRIu64"...0x%"PRIx64")",
>  			src, dst, tx_chunks, count_left);
>  		tmp_buf =3D (uint64_t *)rte_malloc(NULL, ctx->dma_buf_size,
>  			DMA_ALIGN_BYTES);
> --
> 1.8.3.1

Acked-by: Rosen Xu <rosen.xu@intel.com>