brcmfmac: Add check for short event packets
authorKevin Cernekee <cernekee@chromium.org>
Sun, 17 Sep 2017 04:08:24 +0000 (21:08 -0700)
committerKalle Valo <kvalo@codeaurora.org>
Mon, 2 Oct 2017 13:51:21 +0000 (16:51 +0300)
The length of the data in the received skb is currently passed into
brcmf_fweh_process_event() as packet_len, but this value is not checked.
event_packet should be followed by DATALEN bytes of additional event
data.  Ensure that the received packet actually contains at least
DATALEN bytes of additional data, to avoid copying uninitialized memory
into event->data.

Cc: <stable@vger.kernel.org> # v3.8
Suggested-by: Mattias Nissler <mnissler@chromium.org>
Signed-off-by: Kevin Cernekee <cernekee@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c

index 4eb1e1c..ef72baf 100644 (file)
@@ -429,7 +429,8 @@ void brcmf_fweh_process_event(struct brcmf_pub *drvr,
        if (code != BRCMF_E_IF && !fweh->evt_handler[code])
                return;
 
-       if (datalen > BRCMF_DCMD_MAXLEN)
+       if (datalen > BRCMF_DCMD_MAXLEN ||
+           datalen + sizeof(*event_packet) > packet_len)
                return;
 
        if (in_interrupt())