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 <[email protected]> Signed-off-by: Kevin Cernekee <[email protected]> --- 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
