net: mv643xx_eth: fix packet corruption with TSO and tiny unaligned packets.

The code in txq_put_data() would use txq->tx_curr_desc to index the
tso_hdrs/tso_hdrs_dma buffers, for less than 8 bytes unaligned
fragments, which is already moved to the next descriptor at the
beginning of the function.

If that fragment was the last of the the skb, the next skb would use
that same space to place the ip headers, overwritting that small
fragment data.

Fixes: 91986fd3d335 (net: mv643xx_eth: Ensure proper data alignment in TSO TX path)
Signed-off-by: Nicolas Schichan <nschichan@freebox.fr>
Reviewed-by: Philipp Kirchhofer <philipp@familie-kirchhofer.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
Gbp-Pq: Topic bugfix/arm
Gbp-Pq: Name net-mv643xx_eth-fix-packet-corruption-with-tso-and-t.patch

diff --git a/drivers/net/ethernet/marvell/mv643xx_eth.c b/drivers/net/ethernet/marvell/mv643xx_eth.c
index 4182290fdbcf109aadf6a0f25154b71757d3d25c..4f152aa81736fe8ef4db1d5c3f888b059fad1459 100644 (file)
--- a/drivers/net/ethernet/marvell/mv643xx_eth.c
+++ b/drivers/net/ethernet/marvell/mv643xx_eth.c
@@ -762,10 +762,10 @@ txq_put_data_tso(struct net_device *dev, struct tx_queue *txq,
 
        if (length <= 8 && (uintptr_t)data & 0x7) {
                /* Copy unaligned small data fragment to TSO header data area */
-               memcpy(txq->tso_hdrs + txq->tx_curr_desc * TSO_HEADER_SIZE,
+               memcpy(txq->tso_hdrs + tx_index * TSO_HEADER_SIZE,
                       data, length);
                desc->buf_ptr = txq->tso_hdrs_dma
-                       + txq->tx_curr_desc * TSO_HEADER_SIZE;
+                       + tx_index * TSO_HEADER_SIZE;
        } else {
                /* Alignment is okay, map buffer and hand off to hardware */
                txq->tx_desc_mapping[tx_index] = DESC_DMA_MAP_SINGLE;