From: Pavel Skripkin paskripkin@gmail.com
stable inclusion from stable-5.10.53 commit dbbf5b957bd9042d2a71d9ddb9b3d09092548276 bugzilla: 175574 https://gitee.com/openeuler/kernel/issues/I4DTUX
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit c78eaeebe855fd93f2e77142ffd0404a54070d84 upstream.
In case of netdev registration failure the code path will jump to init_fail label:
init_fail: netdev_err(ndev, "init failed\n"); moxart_mac_free_memory(ndev); irq_map_fail: free_netdev(ndev); return ret;
So, there is no need to call free_netdev() before jumping to error handling path, since it can cause UAF or double-free bug.
Fixes: 6c821bd9edc9 ("net: Add MOXA ART SoCs ethernet driver") Signed-off-by: Pavel Skripkin paskripkin@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/net/ethernet/moxa/moxart_ether.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/moxa/moxart_ether.c b/drivers/net/ethernet/moxa/moxart_ether.c index a4380c45f668..a0e1ccca505b 100644 --- a/drivers/net/ethernet/moxa/moxart_ether.c +++ b/drivers/net/ethernet/moxa/moxart_ether.c @@ -541,10 +541,8 @@ static int moxart_mac_probe(struct platform_device *pdev) SET_NETDEV_DEV(ndev, &pdev->dev);
ret = register_netdev(ndev); - if (ret) { - free_netdev(ndev); + if (ret) goto init_fail; - }
netdev_dbg(ndev, "%s: IRQ=%d address=%pM\n", __func__, ndev->irq, ndev->dev_addr);