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authorMoritz Fischer <mdf@kernel.org>2018-05-04 10:18:33 -0700
committerDavid S. Miller <davem@davemloft.net>2018-05-07 23:30:03 -0400
commitabcd3d6fc640aff48b17900734eff134f27fdf2a (patch)
treeb6d7bb613de4014751562c425a72ef1542a009a0 /drivers/net
parent1751eb42ddb56b1e0a28ade5c5f19b7961a6f0c2 (diff)
net: nixge: Fix error path for obtaining mac address
Fix issue where nixge_get_nvmem_address() returns a non-NULL return value on a failed nvmem_cell_get() that causes an invalid access when error value encoded in pointer is dereferenced. Furthermore ensure that buffer allocated by nvmem_cell_read() actually gets kfreed() if the function succeeds. Fixes commit 492caffa8a1a ("net: ethernet: nixge: Add support for National Instruments XGE netdev") Reported-by: Alex Williams <alex.williams@ni.com> Signed-off-by: Moritz Fischer <mdf@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/ni/nixge.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/ethernet/ni/nixge.c b/drivers/net/ethernet/ni/nixge.c
index 27364b7572fc..c41fea9253e3 100644
--- a/drivers/net/ethernet/ni/nixge.c
+++ b/drivers/net/ethernet/ni/nixge.c
@@ -1170,7 +1170,7 @@ static void *nixge_get_nvmem_address(struct device *dev)
cell = nvmem_cell_get(dev, "address");
if (IS_ERR(cell))
- return cell;
+ return NULL;
mac = nvmem_cell_read(cell, &cell_size);
nvmem_cell_put(cell);
@@ -1202,10 +1202,12 @@ static int nixge_probe(struct platform_device *pdev)
ndev->max_mtu = NIXGE_JUMBO_MTU;
mac_addr = nixge_get_nvmem_address(&pdev->dev);
- if (mac_addr && is_valid_ether_addr(mac_addr))
+ if (mac_addr && is_valid_ether_addr(mac_addr)) {
ether_addr_copy(ndev->dev_addr, mac_addr);
- else
+ kfree(mac_addr);
+ } else {
eth_hw_addr_random(ndev);
+ }
priv = netdev_priv(ndev);
priv->ndev = ndev;