linux-ext4 - Re: [PATCH] libext2fs: avoid pointer arithmetic on `void *`

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Date:   Sun, 5 Apr 2020 18:43:09 -0600
From:   Andreas Dilger <adilger@...ger.ca>
To:     Michael Forney <mforney@...rney.org>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH] libext2fs: avoid pointer arithmetic on `void *`

On Apr 4, 2020, at 10:53 PM, Michael Forney <mforney@...rney.org> wrote:
> 
> The pointer operand to the binary `+` operator must be to a complete
> object type.
> 
> Signed-off-by: Michael Forney <mforney@...rney.org>

Seems straight forward enough.  Not needed for GCC, but strictly correct.

Reviewed-by: Andreas Dilger <adilger@...ger.ca>

> ---
> lib/ext2fs/csum.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/ext2fs/csum.c b/lib/ext2fs/csum.c
> index 8513d1ab..c2550365 100644
> --- a/lib/ext2fs/csum.c
> +++ b/lib/ext2fs/csum.c
> @@ -274,7 +274,7 @@ static errcode_t __get_dirent_tail(ext2_filsys fs,
> 		rec_len = translate(d->rec_len);
> 	}
> 
> -	if ((void *)d > ((void *)dirent + fs->blocksize))
> +	if ((char *)d > ((char *)dirent + fs->blocksize))
> 			return EXT2_ET_DIR_CORRUPTED;
> 	if (d != top)
> 		return EXT2_ET_DIR_NO_SPACE_FOR_CSUM;
> --
> 2.26.0
> 


Cheers, Andreas






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