linux-kernel - Re: [PATCH] f2fs: avoid format-overflow warning

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Message-ID: <88b26dc7-93c6-5c96-1bf8-2c2c320f3247@kernel.org>
Date:   Sun, 8 Oct 2023 14:45:23 +0800
From:   Chao Yu <chao@...nel.org>
To:     Su Hui <suhui@...china.com>, jaegeuk@...nel.org
Cc:     linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] f2fs: avoid format-overflow warning

On 2023/10/8 14:39, Su Hui wrote:
> With gcc and W=1 option, there's a warning like this:
> 
> fs/f2fs/compress.c: In function ‘f2fs_init_page_array_cache’:
> fs/f2fs/compress.c:1984:47: error: ‘%u’ directive writing between
> 1 and 7 bytes into a region of size between 5 and 8
> [-Werror=format-overflow=]
>   1984 |  sprintf(slab_name, "f2fs_page_array_entry-%u:%u", MAJOR(dev),
> 		MINOR(dev));
>        |                                               ^~
> 
> String "f2fs_page_array_entry-%u:%u" can up to 35. The first "%u" can up
> to 4 and the second "%u" can up to 7, so total size is "24 + 4 + 7 = 35".
> slab_name's size should be 35 rather than 32.
> 
> Signed-off-by: Su Hui <suhui@...china.com>

Looks good to me, thanks for the patch.

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,