3.5.7.6 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Rob Herring <[email protected]> commit d6fb3be544b46a7611a3373fcaa62b5b0be01888 upstream. The xgmac driver assumes 1 frame per descriptor. If a frame larger than the descriptor's buffer size is received, the frame will spill over into the next descriptor. So check for received frames that span more than one descriptor and discard them. This prevents a crash if we receive erroneous large packets. Signed-off-by: Rob Herring <[email protected]> Cc: [email protected] Cc: [email protected] Signed-off-by: David S. Miller <[email protected]> Signed-off-by: Herton Ronaldo Krzesinski <[email protected]> --- drivers/net/ethernet/calxeda/xgmac.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/ethernet/calxeda/xgmac.c b/drivers/net/ethernet/calxeda/xgmac.c index 8b0a0e4..8a3cd87 100644 --- a/drivers/net/ethernet/calxeda/xgmac.c +++ b/drivers/net/ethernet/calxeda/xgmac.c @@ -546,6 +546,10 @@ static int desc_get_rx_status(struct xgmac_priv *priv, struct xgmac_dma_desc *p) return -1; } + /* All frames should fit into a single buffer */ + if (!(status & RXDESC_FIRST_SEG) || !(status & RXDESC_LAST_SEG)) + return -1; + /* Check if packet has checksum already */ if ((status & RXDESC_FRAME_TYPE) && (status & RXDESC_EXT_STATUS) && !(ext_status & RXDESC_IP_PAYLOAD_MASK)) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
