From: Tim Gardner tim.gardner@canonical.com
[ Upstream commit cd4bc63de774eee95e9bac26a565cd80e0fca421 ]
Coverity complains of a possible dereference of a null return value.
5. returned_null: kzalloc returns NULL. [show details] 6. var_assigned: Assigning: si_data = NULL return value from kzalloc. 488 si_data = kzalloc(data_size, __GFP_DMA | GFP_KERNEL); 489 cbd.length = cpu_to_le16(data_size); 490 491 dma = dma_map_single(&priv->si->pdev->dev, si_data, 492 data_size, DMA_FROM_DEVICE);
While this kzalloc() is unlikely to fail, I did notice that the function returned without unmapping si_data.
Fix this by refactoring the error paths and checking for kzalloc() failure.
Fixes: 888ae5a3952ba ("net: enetc: add tc flower psfp offload driver") Cc: Claudiu Manoil claudiu.manoil@nxp.com Cc: "David S. Miller" davem@davemloft.net Cc: Jakub Kicinski kuba@kernel.org Cc: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org (open list) Signed-off-by: Tim Gardner tim.gardner@canonical.com Acked-by: Claudiu Manoil claudiu.manoil@nxp.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- .../net/ethernet/freescale/enetc/enetc_qos.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/drivers/net/ethernet/freescale/enetc/enetc_qos.c b/drivers/net/ethernet/freescale/enetc/enetc_qos.c index dbceb99c4441a..9e6988fd3787a 100644 --- a/drivers/net/ethernet/freescale/enetc/enetc_qos.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_qos.c @@ -486,14 +486,16 @@ static int enetc_streamid_hw_set(struct enetc_ndev_priv *priv,
data_size = sizeof(struct streamid_data); si_data = kzalloc(data_size, __GFP_DMA | GFP_KERNEL); + if (!si_data) + return -ENOMEM; cbd.length = cpu_to_le16(data_size);
dma = dma_map_single(&priv->si->pdev->dev, si_data, data_size, DMA_FROM_DEVICE); if (dma_mapping_error(&priv->si->pdev->dev, dma)) { netdev_err(priv->si->ndev, "DMA mapping failed!\n"); - kfree(si_data); - return -ENOMEM; + err = -ENOMEM; + goto out; }
cbd.addr[0] = lower_32_bits(dma); @@ -513,12 +515,10 @@ static int enetc_streamid_hw_set(struct enetc_ndev_priv *priv,
err = enetc_send_cmd(priv->si, &cbd); if (err) - return -EINVAL; + goto out;
- if (!enable) { - kfree(si_data); - return 0; - } + if (!enable) + goto out;
/* Enable the entry overwrite again incase space flushed by hardware */ memset(&cbd, 0, sizeof(cbd)); @@ -563,6 +563,10 @@ static int enetc_streamid_hw_set(struct enetc_ndev_priv *priv, }
err = enetc_send_cmd(priv->si, &cbd); +out: + if (!dma_mapping_error(&priv->si->pdev->dev, dma)) + dma_unmap_single(&priv->si->pdev->dev, dma, data_size, DMA_FROM_DEVICE); + kfree(si_data);
return err;