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net: qualcomm: rmnet: Skip processing loopback packets

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[ Upstream commit a07f388e2c ]

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: ceed73a2cf ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Sean Tranchetti
2018-10-18 09:18:08 +02:00
committed by Greg Kroah-Hartman
parent 3ab83c6a1f
commit 3283c92e91
1 changed files with 3 additions and 0 deletions
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drivers/net/ethernet/qualcomm/rmnet/rmnet_handlers.c
+3
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@@ -189,6 +189,9 @@ rx_handler_result_t rmnet_rx_handler(struct sk_buff **pskb)
if (!skb)
goto done;
if (skb->pkt_type == PACKET_LOOPBACK)
return RX_HANDLER_PASS;
dev = skb->dev;
port = rmnet_get_port(dev);