linux-kernel - Re: something odd in emu10k1/emufx

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Message-ID: <s5h63xqkvh6.wl%tiwai@suse.de>
Date:	Sat, 19 Jan 2008 10:36:37 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: something odd in emu10k1/emufx

At Sat, 19 Jan 2008 02:16:14 +0000,
Al Viro wrote:
> 
> In copy_tlv() we have
>         tlv = kmalloc(data[1] * 4 + sizeof(data), GFP_KERNEL);
>         if (!tlv)
>                 return NULL;
>         memcpy(tlv, data, sizeof(data));
>         if (copy_from_user(tlv + 2, _tlv + 2, data[1])) {
>                 kfree(tlv);
>                 return NULL;
>         }
> which looks rather odd, since either we kmalloc too much or copy too little...
> Comments?

It's the former case.  The total length should be data[1] +
sizeof(data).  I fixed on ALSA tree now.

Thanks,

Takashi
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