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Re: [PATCH] brcmfmac: buffer overflow in brcmf_cfg80211_mgmt_tx()

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On 7/7/2017 10:46 AM, Dan Carpenter wrote:
On Thu, Jul 06, 2017 at 03:32:42PM -0700, Linus Torvalds wrote:
On Thu, Jul 6, 2017 at 10:11 AM, Arend van Spriel
<arend.vanspriel@xxxxxxxxxxxx> wrote:

Looks fine to me so ...

I really think that if we can't trust 'len', then we have to check
against the lower bound of DOT11_MGMT_HDR_LEN too, because otherwise
we'll just have a big 16-bit number instead.

There is already a check in cfg80211_mlme_mgmt_tx().

	if (params->len < 24 + 1)
		return -EINVAL;

It probably should be using DOT11_MGMT_HDR_LEN instead of a magic 24.

Missed that check when I looked yesterday evening. Must have been the time ;-)

Regards,
Arend



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