linux-kernel - RE: [PATCH] dma-mapping: Fix sizeof() mismatch on tsk allocation

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Date:   Wed, 25 Nov 2020 18:26:18 +0000
From:   "Song Bao Hua (Barry Song)" <song.bao.hua@...ilicon.com>
To:     Colin King <colin.king@...onical.com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] dma-mapping: Fix sizeof() mismatch on tsk allocation



> -----Original Message-----
> From: Colin King [mailto:colin.king@...onical.com]
> Sent: Thursday, November 26, 2020 3:05 AM
> To: Song Bao Hua (Barry Song) <song.bao.hua@...ilicon.com>; Christoph
> Hellwig <hch@....de>; Marek Szyprowski <m.szyprowski@...sung.com>;
> Robin Murphy <robin.murphy@....com>; iommu@...ts.linux-foundation.org
> Cc: kernel-janitors@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [PATCH] dma-mapping: Fix sizeof() mismatch on tsk allocation
> 
> From: Colin Ian King <colin.king@...onical.com>
> 
> An incorrect sizeof() is being used, sizeof(tsk) is not correct, it should
> be sizeof(*tsk). Fix it.
> 
> Addresses-Coverity: ("Sizeof not portable (SIZEOF_MISMATCH)")
> Fixes: bfd2defed94d ("dma-mapping: add benchmark support for streaming
> DMA APIs")
> Signed-off-by: Colin Ian King <colin.king@...onical.com>
> ---
>  kernel/dma/map_benchmark.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/kernel/dma/map_benchmark.c b/kernel/dma/map_benchmark.c
> index e1e37603d01b..b1496e744c68 100644
> --- a/kernel/dma/map_benchmark.c
> +++ b/kernel/dma/map_benchmark.c
> @@ -121,7 +121,7 @@ static int do_map_benchmark(struct
> map_benchmark_data *map)
>  	int ret = 0;
>  	int i;
> 
> -	tsk = kmalloc_array(threads, sizeof(tsk), GFP_KERNEL);
> +	tsk = kmalloc_array(threads, sizeof(*tsk), GFP_KERNEL);

The size is same. But the change is correct.
Acked-by: Barry Song <song.bao.hua@...ilicon.com>

>  	if (!tsk)
>  		return -ENOMEM;
> 
Thanks
Barry