Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 10/43] net: cavium: liquidio: Avoid dma_unmap_single on uninitialized ndata | Date | Mon, 1 May 2017 14:27:10 -0700 |
| |
4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Florian Fainelli <f.fainelli@gmail.com>
commit 8e6ce7ebeb34f0992f56de078c3744fb383657fa upstream.
The label lio_xmit_failed is used 3 times through liquidio_xmit() but it always makes a call to dma_unmap_single() using potentially uninitialized variables from "ndata" variable. Out of the 3 gotos, 2 run after ndata has been initialized, and had a prior dma_map_single() call.
Fix this by adding a new error label: lio_xmit_dma_failed which does this dma_unmap_single() and then processed with the lio_xmit_failed fallthrough.
Fixes: f21fb3ed364bb ("Add support of Cavium Liquidio ethernet adapters") Reported-by: coverity (CID 1309740) Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Cc: Julia Lawall <julia.lawall@lip6.fr> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/net/ethernet/cavium/liquidio/lio_main.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-)
--- a/drivers/net/ethernet/cavium/liquidio/lio_main.c +++ b/drivers/net/ethernet/cavium/liquidio/lio_main.c @@ -2823,7 +2823,7 @@ static int liquidio_xmit(struct sk_buff if (!g) { netif_info(lio, tx_err, lio->netdev, "Transmit scatter gather: glist null!\n"); - goto lio_xmit_failed; + goto lio_xmit_dma_failed; } cmdsetup.s.gather = 1; @@ -2894,7 +2894,7 @@ static int liquidio_xmit(struct sk_buff else status = octnet_send_nic_data_pkt(oct, &ndata, xmit_more); if (status == IQ_SEND_FAILED) - goto lio_xmit_failed; + goto lio_xmit_dma_failed; netif_info(lio, tx_queued, lio->netdev, "Transmit queued successfully\n"); @@ -2908,12 +2908,13 @@ static int liquidio_xmit(struct sk_buff return NETDEV_TX_OK; +lio_xmit_dma_failed: + dma_unmap_single(&oct->pci_dev->dev, ndata.cmd.dptr, + ndata.datasize, DMA_TO_DEVICE); lio_xmit_failed: stats->tx_dropped++; netif_info(lio, tx_err, lio->netdev, "IQ%d Transmit dropped:%llu\n", iq_no, stats->tx_dropped); - dma_unmap_single(&oct->pci_dev->dev, ndata.cmd.dptr, - ndata.datasize, DMA_TO_DEVICE); recv_buffer_free(skb); return NETDEV_TX_OK; }
| |