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mwifiex: pcie: tighten a check in mwifiex_pcie_process_event_ready()

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If "evt_len" is 1 then we try to memcpy() negative 3 bytes and it would
cause memory corruption.

Fixes: d930faee14 ("mwifiex: add support for Marvell pcie8766 chipset")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Dan Carpenter 2018-04-05 14:17:19 +03:00 • committed by Kalle Valo
parent c1003538bf
commit 01eca28428
1 changed files with 2 additions and 1 deletions
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3
drivers/net/wireless/marvell/mwifiex/pcie.c
View file

@ -1881,7 +1881,8 @@ static int mwifiex_pcie_process_event_ready(struct mwifiex_adapter *adapter)
mwifiex_dbg(adapter, EVENT,
"info: Event length: %d\n", evt_len);
if ((evt_len > 0) && (evt_len < MAX_EVENT_SIZE))
if (evt_len > MWIFIEX_EVENT_HEADER_LEN &&
evt_len < MAX_EVENT_SIZE)
memcpy(adapter->event_body, skb_cmd->data +
MWIFIEX_EVENT_HEADER_LEN, evt_len -
MWIFIEX_EVENT_HEADER_LEN);