linux-kernel - Re: [PATCH 4/5] libubigen: Maintain a eraseblock association table

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Message-ID: <cc8f9abd-42b7-cc71-b89c-92c5cbd84aa3@sigma-star.at>
Date:   Tue, 15 May 2018 21:58:01 +0200
From:   David Oberhollenzer <goliath@...ma-star.at>
To:     Richard Weinberger <richard@....at>, linux-mtd@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] libubigen: Maintain a eraseblock association table

On 05/14/2018 01:25 PM, Richard Weinberger wrote:
> @@ -229,6 +234,12 @@ int ubigen_write_volume(const struct ubigen_info *ui,
>  		memset(outbuf + ui->data_offs + len, 0xFF,
>  		       ui->peb_size - ui->data_offs - len);
>  
> +		vi->eba[lnum] = lseek(out, 0, SEEK_CUR) / ui->peb_size;
> +		if (vi->eba[lnum] == -1) {
> +			sys_errmsg("cannot get offset of output file");
> +			goto out_free1;
> +		}
> +
>  		if (write(out, outbuf, ui->peb_size) != ui->peb_size) {
>  			sys_errmsg("cannot write %d bytes to the output file", ui->peb_size);
>  			goto out_free1;

Wouldn't that division swallow errors? If I interpret the C99 draft correctly, dividing
an lseek return value of -1 by ui->peb_size > 1 should result in 0.

Thanks,

David