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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: "barebox@lists.infradead.org" <barebox@lists.infradead.org>
Subject: [BUG] mtd: cfi-flash: comparison of unsigned expression in '>= 0' is always true
Date: Mon, 17 May 2021 13:29:05 +0200
Message-ID: <ce838b2e-bcb8-d13b-8c49-7ffee194094a@pengutronix.de> (raw)

Hi,

The new warning correctly flags following piece of code in
drivers/mtd/nor/cfi_flash.c:

/* loop through the sectors from the highest address
 * when the passed address is greater or equal to the sector address
 * we have a match
 */
flash_sect_t find_sector(struct flash_info *info, unsigned long addr)
{
        flash_sect_t sector;

        for (sector = info->sector_count - 1; sector >= 0; sector--) {
                if (addr >= info->start[sector])
                        break;
        }

        return sector;
}

If addr is indeed unmapped by info->start[*], this would be an infinite
loop. I don't know what the correct fix would be though. Any suggestions?

Cheers,
Ahmad

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             reply	other threads:[~2021-05-17 11:30 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-17 11:29 Ahmad Fatoum [this message]
2021-05-18  6:26 ` Sascha Hauer

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