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mwifiex: avoid processing RX packets with invalid length

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If rx_len received in interface header from FW is more than
RX buffer size, skb_put for such length results into skb_panic.
Avoid this by not processing such packets. We just print a warning
for such packets and free skb.

Reviewed-by: Paul Stewart <pstew@chromium.org>
Signed-off-by: Avinash Patil <patila@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: Marc Yang <yangyang@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Avinash Patil 2014-09-12 20:08:47 +05:30 committed by John W. Linville
parent 3c99832d74
commit 42a028aa95
1 changed files with 14 additions and 6 deletions
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20
drivers/net/wireless/mwifiex/pcie.c
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@ -1271,12 +1271,20 @@ static int mwifiex_pcie_process_recv_data(struct mwifiex_adapter *adapter)
*/
pkt_len = *((__le16 *)skb_data->data);
rx_len = le16_to_cpu(pkt_len);
skb_put(skb_data, rx_len);
dev_dbg(adapter->dev,
"info: RECV DATA: Rd=%#x, Wr=%#x, Len=%d\n",
card->rxbd_rdptr, wrptr, rx_len);
skb_pull(skb_data, INTF_HEADER_LEN);
mwifiex_handle_rx_packet(adapter, skb_data);
if (WARN_ON(rx_len <= INTF_HEADER_LEN ||
rx_len > MWIFIEX_RX_DATA_BUF_SIZE)) {
dev_err(adapter->dev,
"Invalid RX len %d, Rd=%#x, Wr=%#x\n",
rx_len, card->rxbd_rdptr, wrptr);
dev_kfree_skb_any(skb_data);
} else {
skb_put(skb_data, rx_len);
dev_dbg(adapter->dev,
"info: RECV DATA: Rd=%#x, Wr=%#x, Len=%d\n",
card->rxbd_rdptr, wrptr, rx_len);
skb_pull(skb_data, INTF_HEADER_LEN);
mwifiex_handle_rx_packet(adapter, skb_data);
}
skb_tmp = dev_alloc_skb(MWIFIEX_RX_DATA_BUF_SIZE);
if (!skb_tmp) {