4.14-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit a07f388e2cde2be74b263f85df6f672fea0305a1 ]
RMNET RX handler was processing invalid packets that were originally sent on the real device and were looped back via dev_loopback_xmit(). This was detected using syzkaller.
Fixes: ceed73a2cf4a ("drivers: net: ethernet: qualcomm: rmnet: Initial implementation") Signed-off-by: Sean Tranchetti stranche@codeaurora.org Signed-off-by: Subash Abhinov Kasiviswanathan subashab@codeaurora.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c index 929fb8d96ec0..8d979fef5fc7 100644 --- a/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c +++ b/drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c @@ -205,6 +205,9 @@ rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb) if (!skb) return RX_HANDLER_CONSUMED;
+ if (skb->pkt_type == PACKET_LOOPBACK) + return RX_HANDLER_PASS; + dev = skb->dev; port = rmnet_get_port(dev);