wifi: brcmfmac: cyw: fix heap overflow on a short auth frame

brcmf_notify_auth_frame_rx() takes the frame length from the firmware
event and copies the frame body with the management header offset
subtracted:

	u32 mgmt_frame_len = e->datalen - sizeof(struct brcmf_rx_mgmt_data);
	...
	memcpy(&mgmt_frame->u, frame,
	       mgmt_frame_len - offsetof(struct ieee80211_mgmt, u));

The only length check is e->datalen >= sizeof(*rxframe), so mgmt_frame_len
can be anything from 0 up. offsetof(struct ieee80211_mgmt, u) is 24. When
mgmt_frame_len is below that, the subtraction wraps as an unsigned value to
a huge length. The memcpy then runs far past the kzalloc'd buffer. A
malicious or malfunctioning AP can make the frame short during the
external SAE auth exchange, so this is a remotely triggered heap overflow.

Reject frames shorter than the management header offset before the copy.

Fixes: 66f9093 ("wifi: brcmfmac: cyw: support external SAE authentication in station mode")
Link: https://lore.kernel.org/r/178214417708.2368577.16740907093694208834@maoyixie.com
Cc: stable@vger.kernel.org
Co-developed-by: Kaixuan Li <kaixuan.li@ntu.edu.sg>
Signed-off-by: Kaixuan Li <kaixuan.li@ntu.edu.sg>
Signed-off-by: Maoyi Xie <maoyixie.tju@gmail.com>
Acked-by: Arend van Spriel <arend.vanspriel@broadcom.com>
Link: https://patch.msgid.link/20260627131313.3878893-1-maoyixie.tju@gmail.com
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

Author: maoyixie

drivers/net/wireless/broadcom/brcm80211/brcmfmac/cyw/core.c

@@ -293,6 +293,12 @@ brcmf_notify_auth_frame_rx(struct brcmf_if *ifp,
 		return -EINVAL;
 	}
 
+	if (mgmt_frame_len < offsetof(struct ieee80211_mgmt, u)) {
+		bphy_err(drvr, "Event %s (%d) frame too small. Ignore\n",
+			 brcmf_fweh_event_name(e->event_code), e->event_code);
+		return -EINVAL;
+	}
+
 	wdev = &ifp->vif->wdev;
 	WARN_ON(!wdev);