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brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx()

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commit 8f44c9a41386729fea410e688959ddaa9d51be7c upstream.

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));

Fixes: 18e2f61db3b70 ("brcmfmac: P2P action frame tx.")
Reported-by: "freenerguo(郭大兴)" <freenerguo@tencent.com>
Signed-off-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arend van Spriel 2017-07-07 21:09:06 +01:00 committed by Greg Kroah-Hartman
parent 181dda46a3
commit 414848bba6
1 changed files with 5 additions and 0 deletions
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5
drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
View File

@ -4928,6 +4928,11 @@ brcmf_cfg80211_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
cfg80211_mgmt_tx_status(wdev, *cookie, buf, len, true,
GFP_KERNEL);
} else if (ieee80211_is_action(mgmt->frame_control)) {
if (len > BRCMF_FIL_ACTION_FRAME_SIZE + DOT11_MGMT_HDR_LEN) {
brcmf_err("invalid action frame length\n");
err = -EINVAL;
goto exit;
}
af_params = kzalloc(sizeof(*af_params), GFP_KERNEL);
if (af_params == NULL) {
brcmf_err("unable to allocate frame\n");