Make sure mwifiex_process_mgmt_packet,
mwifiex_process_sta_rx_packet and mwifiex_process_uap_rx_packet,
mwifiex_uap_queue_bridged_pkt and mwifiex_process_rx_packet
not out-of-bounds access the skb->data buffer.
Fixes: 2dbaf751b1de ("mwifiex: report received management frames to cfg80211")
Signed-off-by: Polaris Pi <pinkperfect2021@xxxxxxxxx>
---
V5: Follow chromeos comments: preserve the original flow of mwifiex_process_uap_rx_packet
V6: Simplify check in mwifiex_process_uap_rx_packet
V7: Fix drop packets issue when auotest V6, now pass manual and auto tests
---
drivers/net/wireless/marvell/mwifiex/sta_rx.c | 11 ++++++++++-
.../net/wireless/marvell/mwifiex/uap_txrx.c | 19 +++++++++++++++++++
drivers/net/wireless/marvell/mwifiex/util.c | 10 +++++++---
3 files changed, 36 insertions(+), 4 deletions(-)
diff --git a/drivers/net/wireless/marvell/mwifiex/sta_rx.c b/drivers/net/wireless/marvell/mwifiex/sta_rx.c
index 13659b02ba88..f2899d53a43f 100644
--- a/drivers/net/wireless/marvell/mwifiex/sta_rx.c
+++ b/drivers/net/wireless/marvell/mwifiex/sta_rx.c
@@ -86,6 +86,14 @@ int mwifiex_process_rx_packet(struct mwifiex_private *priv,
rx_pkt_len = le16_to_cpu(local_rx_pd->rx_pkt_length);
rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_off;
+ if (sizeof(*rx_pkt_hdr) + rx_pkt_off > skb->len) {
+ mwifiex_dbg(priv->adapter, ERROR,
+ "wrong rx packet offset: len=%d, rx_pkt_off=%d\n",
+ skb->len, rx_pkt_off);
+ priv->stats.rx_dropped++;
+ dev_kfree_skb_any(skb);
+ }
+
if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
sizeof(bridge_tunnel_header))) ||
(!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
@@ -194,7 +202,8 @@ int mwifiex_process_sta_rx_packet(struct mwifiex_private *priv,
rx_pkt_hdr = (void *)local_rx_pd + rx_pkt_offset;
- if ((rx_pkt_offset + rx_pkt_length) > (u16) skb->len) {
+ if ((rx_pkt_offset + rx_pkt_length) > skb->len ||
+ sizeof(rx_pkt_hdr->eth803_hdr) + rx_pkt_offset > skb->len) {
mwifiex_dbg(adapter, ERROR,
"wrong rx packet: len=%d, rx_pkt_offset=%d, rx_pkt_length=%d\n",
skb->len, rx_pkt_offset, rx_pkt_length);
diff --git a/drivers/net/wireless/marvell/mwifiex/uap_txrx.c b/drivers/net/wireless/marvell/mwifiex/uap_txrx.c
index e495f7eaea03..04ff051f5d18 100644
--- a/drivers/net/wireless/marvell/mwifiex/uap_txrx.c
+++ b/drivers/net/wireless/marvell/mwifiex/uap_txrx.c
@@ -103,6 +103,15 @@ static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
return;
}
+ if (sizeof(*rx_pkt_hdr) +
+ le16_to_cpu(uap_rx_pd->rx_pkt_offset) > skb->len) {
+ mwifiex_dbg(adapter, ERROR,
+ "wrong rx packet offset: len=%d,rx_pkt_offset=%d\n",
+ skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
+ priv->stats.rx_dropped++;
+ dev_kfree_skb_any(skb);
+ }
+
if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
sizeof(bridge_tunnel_header))) ||
(!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
@@ -367,6 +376,16 @@ int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
+ if (le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
+ sizeof(rx_pkt_hdr->eth803_hdr) > skb->len) {
+ mwifiex_dbg(adapter, ERROR,
+ "wrong rx packet for struct ethhdr: len=%d, offset=%d\n",
+ skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
+ priv->stats.rx_dropped++;
+ dev_kfree_skb_any(skb);
+ return 0;
+ }
+
ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source);
if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
diff --git a/drivers/net/wireless/marvell/mwifiex/util.c b/drivers/net/wireless/marvell/mwifiex/util.c
index 94c2d219835d..745b1d925b21 100644
--- a/drivers/net/wireless/marvell/mwifiex/util.c
+++ b/drivers/net/wireless/marvell/mwifiex/util.c
@@ -393,11 +393,15 @@ mwifiex_process_mgmt_packet(struct mwifiex_private *priv,
}
rx_pd = (struct rxpd *)skb->data;
+ pkt_len = le16_to_cpu(rx_pd->rx_pkt_length);
+ if (pkt_len < sizeof(struct ieee80211_hdr) + sizeof(pkt_len)) {
+ mwifiex_dbg(priv->adapter, ERROR, "invalid rx_pkt_length");
+ return -1;
+ }
skb_pull(skb, le16_to_cpu(rx_pd->rx_pkt_offset));
skb_pull(skb, sizeof(pkt_len));
-
- pkt_len = le16_to_cpu(rx_pd->rx_pkt_length);
+ pkt_len -= sizeof(pkt_len);
ieee_hdr = (void *)skb->data;
if (ieee80211_is_mgmt(ieee_hdr->frame_control)) {
@@ -410,7 +414,7 @@ mwifiex_process_mgmt_packet(struct mwifiex_private *priv,
skb->data + sizeof(struct ieee80211_hdr),
pkt_len - sizeof(struct ieee80211_hdr));
- pkt_len -= ETH_ALEN + sizeof(pkt_len);
+ pkt_len -= ETH_ALEN;
rx_pd->rx_pkt_length = cpu_to_le16(pkt_len);
cfg80211_rx_mgmt(&priv->wdev, priv->roc_cfg.chan.center_freq,
--
2.25.1
