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[PATCH V3 3/3] brcmfmac: Add check for short event packets

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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.

Suggested-by: Mattias Nissler <mnissler@xxxxxxxxxxxx>
Signed-off-by: Kevin Cernekee <cernekee@xxxxxxxxxxxx>
---
 drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)


V2->V3: Change '<' to '>' and retest


diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c
index 27e661fa356f..e7eaa57d11d9 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/fweh.c
@@ -424,7 +424,8 @@ 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())
-- 
2.14.1.690.gbb1197296e-goog




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