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From: Johannes Berg <>
To: Arend van Spriel <>,
	Kalle Valo <>
Cc: Linus Torvalds <>,
Subject: Re: [PATCH] brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx()
Date: Fri, 07 Jul 2017 15:17:53 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <> (sfid-20170707_140140_467929_3104918C)

On Fri, 2017-07-07 at 13:01 +0100, Arend van Spriel wrote:
> The lower level nl80211 code in cfg80211 ensures that "len" is
> between
> 25 and NL80211_ATTR_FRAME (2304).  We subtract DOT11_MGMT_HDR_LEN
> (24) from
> "len" so thats's max of 2280.  However, the action_frame->data[]
> buffer is
> only BRCMF_FIL_ACTION_FRAME_SIZE (1800) bytes long so this memcpy()
> can
> overflow.
> 	memcpy(action_frame->data, &buf[DOT11_MGMT_HDR_LEN],
> 	       le16_to_cpu(action_frame->len));

Kalle is on vacation for the next 10 days or so.

Linus, since you were involved already, will you apply this directly?

Arend, otherwise please resend including netdev@, so we can ask davem
to pick it up (needs to land in his patchwork).

I guess it should also have a Cc: stable tag, and perhaps a Fixes?


  parent reply	other threads:[~2017-07-07 13:17 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-07-07 12:01 [PATCH] brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx() Arend van Spriel
2017-07-07 12:47 ` Sedat Dilek
2017-07-07 19:39   ` Arend van Spriel
2017-07-12  9:59     ` Sedat Dilek
2017-07-07 13:17 ` Johannes Berg [this message]
2017-07-07 16:37   ` Linus Torvalds

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