netdev - linux-4.2-rc2/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:1993: possible bad error checking ?

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Date:	Mon, 13 Jul 2015 09:48:59 +0000
From:	David Binderman <dcb314@...mail.com>
To:	Giuseppe Cavallaro <peppe.cavallaro@...com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: linux-4.2-rc2/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:1993:
 possible bad error checking ?

Hello there,

[linux-4.2-rc2/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c:1993]: (style) Checking if unsigned variable 'entry' is less than zero.

Source code is

        entry = priv->hw->mode->jumbo_frm(priv, skb, csum_insertion);
        if (unlikely(entry < 0))
            goto dma_map_err;

but

    unsigned int entry;

So the error checking from the function call looks broken to me.

If the return value from the function call to jumbo_frm is a plain signed integer, suggest
sanity check that *before* assigning into an unsigned integer.

Regards

David Binderman

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