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[1/3] net: ethernet: ezchip: fix UAF in nps_enet_remove

Message ID b04b3823c002aac127c16472b150466afe9b38a9.1624032669.git.paskripkin@gmail.com (mailing list archive)
State Accepted
Commit e4b8700e07a86e8eab6916aa5c5ba99042c34089
Delegated to: Netdev Maintainers
Headers show
Series net: ethernat: ezchip: bug fixing and code improvments | expand

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netdev/source_inline success Was 0 now: 0
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netdev/module_param success Was 0 now: 0
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 9 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
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Commit Message

Pavel Skripkin June 18, 2021, 4:14 p.m. UTC
priv is netdev private data, but it is used
after free_netdev(). It can cause use-after-free when accessing priv
pointer. So, fix it by moving free_netdev() after netif_napi_del()
call.

Fixes: 0dd077093636 ("NET: Add ezchip ethernet driver")
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
---
 drivers/net/ethernet/ezchip/nps_enet.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/net/ethernet/ezchip/nps_enet.c b/drivers/net/ethernet/ezchip/nps_enet.c
index e3954d8835e7..20d2c2bb26e4 100644
--- a/drivers/net/ethernet/ezchip/nps_enet.c
+++ b/drivers/net/ethernet/ezchip/nps_enet.c
@@ -642,8 +642,8 @@  static s32 nps_enet_remove(struct platform_device *pdev)
 	struct nps_enet_priv *priv = netdev_priv(ndev);
 
 	unregister_netdev(ndev);
-	free_netdev(ndev);
 	netif_napi_del(&priv->napi);
+	free_netdev(ndev);
 
 	return 0;
 }