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| author | Arend van Spriel <arend.vanspriel@broadcom.com> | 2017-07-07 21:09:06 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-21 07:44:55 +0200 |
| commit | 4c7021c2fb74047649c03845ce6fd13626a5a418 (patch) | |
| tree | cc21513fe63befc774f2d923bc397618be6e6e5a | |
| parent | 9618eb4af306e7f21330a6acf22cbec037d17f22 (diff) | |
| download | linux-stable-4c7021c2fb74047649c03845ce6fd13626a5a418.tar.gz linux-stable-4c7021c2fb74047649c03845ce6fd13626a5a418.tar.bz2 linux-stable-4c7021c2fb74047649c03845ce6fd13626a5a418.zip | |
brcmfmac: fix possible buffer overflow in brcmf_cfg80211_mgmt_tx()
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>
| -rw-r--r-- | drivers/net/wireless/brcm80211/brcmfmac/cfg80211.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/wireless/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/brcm80211/brcmfmac/cfg80211.c index 70a6985334d5..da5826d788d6 100644 --- a/drivers/net/wireless/brcm80211/brcmfmac/cfg80211.c +++ b/drivers/net/wireless/brcm80211/brcmfmac/cfg80211.c @@ -4472,6 +4472,11 @@ 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"); |