linux-kernel - Re: [PATCH v2] fs/ntfs3: Use kcalloc/kmalloc

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Message-ID: <ef1d002a0720ace0ed8dd79c2ac3c600@perches.com>
Date:   Tue, 17 Aug 2021 16:12:08 -0700
From:   Joe Perches <joe@...ches.com>
To:     Kari Argillander <kari.argillander@...il.com>
Cc:     Konstantin Komarov <almaz.alexandrovich@...agon-software.com>,
        ntfs3@...ts.linux.dev, Christoph Hellwig <hch@....de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] fs/ntfs3: Use kcalloc/kmalloc_array over
 kzalloc/kmalloc

On 2021-08-17 12:38, Kari Argillander wrote:
> Use kcalloc/kmalloc_array over kzalloc/kmalloc when we allocate array.
> Checkpatch found these after we did not use our own defined allocation
> wrappers.
[]
> diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
[]
> @@ -900,7 +900,7 @@ static ssize_t ntfs_compress_write(struct kiocb
> *iocb, struct iov_iter *from)
>  		return -EOPNOTSUPP;
>  	}
> 
> -	pages = kmalloc(pages_per_frame * sizeof(struct page *), GFP_NOFS);
> +	pages = kcalloc(pages_per_frame, sizeof(struct page *), GFP_NOFS);

This is not an exact transformation.
This allocates zeroed memory.
Use kmalloc_array here instead.