diff options
| author | Breno Leitao <leitao@debian.org> | 2024-07-24 01:05:23 -0700 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-07-25 11:24:03 +0200 |
| commit | 16f3a28cf5f876a7f3550d8f4c870a7b41bcfaef (patch) | |
| tree | 3663e35a1cd909e43fb4b8c86c973ef98845915a /drivers/net | |
| parent | e6d08d7ecf1b675b4b174d696badc36706c4233c (diff) | |
net: mediatek: Fix potential NULL pointer dereference in dummy net_device handling
Move the freeing of the dummy net_device from mtk_free_dev() to
mtk_remove().
Previously, if alloc_netdev_dummy() failed in mtk_probe(),
eth->dummy_dev would be NULL. The error path would then call
mtk_free_dev(), which in turn called free_netdev() assuming dummy_dev
was allocated (but it was not), potentially causing a NULL pointer
dereference.
By moving free_netdev() to mtk_remove(), we ensure it's only called when
mtk_probe() has succeeded and dummy_dev is fully allocated. This
addresses a potential NULL pointer dereference detected by Smatch[1].
Fixes: b209bd6d0bff ("net: mediatek: mtk_eth_sock: allocate dummy net_device dynamically")
Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/all/4160f4e0-cbef-4a22-8b5d-42c4d399e1f7@stanley.mountain/ [1]
Suggested-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Dan Carpenter <dan.carpenter@linaro.org>
Signed-off-by: Breno Leitao <leitao@debian.org>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20240724080524.2734499-1-leitao@debian.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/ethernet/mediatek/mtk_eth_soc.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index 0cc2dd85652f..16ca427cf4c3 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -4223,8 +4223,6 @@ static int mtk_free_dev(struct mtk_eth *eth) metadata_dst_free(eth->dsa_meta[i]); } - free_netdev(eth->dummy_dev); - return 0; } @@ -5090,6 +5088,7 @@ static void mtk_remove(struct platform_device *pdev) netif_napi_del(ð->tx_napi); netif_napi_del(ð->rx_napi); mtk_cleanup(eth); + free_netdev(eth->dummy_dev); mtk_mdio_cleanup(eth); } |