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46 lines
1.9 KiB
Diff
46 lines
1.9 KiB
Diff
From 8f44c9a41386729fea410e688959ddaa9d51be7c Mon Sep 17 00:00:00 2001
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From: Arend van Spriel <arend.vanspriel@broadcom.com>
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Date: Fri, 7 Jul 2017 21:09:06 +0100
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Subject: brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The lower level nl80211 code in cfg80211 ensures that "len" is between
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25 and NL80211_ATTR_FRAME (2304). We subtract DOT11_MGMT_HDR_LEN (24) from
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"len" so thats's max of 2280. However, the action_frame->data[] buffer is
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only BRCMF_FIL_ACTION_FRAME_SIZE (1800) bytes long so this memcpy() can
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overflow.
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memcpy(action_frame->data, &buf[DOT11_MGMT_HDR_LEN],
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le16_to_cpu(action_frame->len));
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Cc: stable@vger.kernel.org # 3.9.x
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Fixes: 18e2f61db3b70 ("brcmfmac: P2P action frame tx.")
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Reported-by: "freenerguo(郭大兴)" <freenerguo@tencent.com>
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Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c | 5 +++++
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1 file changed, 5 insertions(+)
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diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
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index dcde596..7e689c8 100644
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--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
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+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
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@@ -4934,6 +4934,11 @@ brcmf_cfg80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
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cfg80211_mgmt_tx_status(wdev, *cookie, buf, len, true,
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GFP_KERNEL);
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} else if (ieee80211_is_action(mgmt->frame_control)) {
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+ if (len > BRCMF_FIL_ACTION_FRAME_SIZE + DOT11_MGMT_HDR_LEN) {
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+ brcmf_err("invalid action frame length\n");
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+ err = -EINVAL;
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+ goto exit;
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+ }
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af_params = kzalloc(sizeof(*af_params), GFP_KERNEL);
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if (af_params == NULL) {
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brcmf_err("unable to allocate frame\n");
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--
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cgit v1.1
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