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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1774715597; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=BQAfoUisJ6V0zmjJY8J3so7sKalecxOlLQSbXuTuX9E=; b=KJJw8ahx7Jck7gs/XkaQsS2Mh7QMyEdHPanzyPN8WKT2Q2kdk+gWoRd9PxoisgRrh9WFzd MeeIfFufbjLj7JfDfzXf22GfRokFsIQSiAgargO2grbpvr9vXwgbURvEP29/6kMTonGArV x8TYq/E56UPNMa8Qzm0jwWcKcXpnkH0= From: Yufan Chen To: Andrew Lunn , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: yufan.chen@linux.dev Subject: [PATCH net v2] net: ftgmac100: fix ring allocation unwind on open failure Date: Sun, 29 Mar 2026 00:32:57 +0800 Message-ID: <20260328163257.60836-1-yufan.chen@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2537; i=ericterminal@gmail.com; h=from:subject; bh=Fq6eHI+AA+1FVZs9j/tF5tTRiJpn5tD7qFqbJjL24RM=; b=owGbwMvMwCXWM/dCzeS3H+sZT6slMWSeYGpJ2uknrZ35KvPcluPf81jsSrq+vO77K+Zz71aLd EXsHB21joksDGJcDJZiiix3/++bm+t1a8517sO5MHNYmUCGSIs0MAABCwNfbmJeqZGOkZ6ptqGe oZGOgY4xAxenAEy1vQnDP7OZv8QfzDm5aM+1fYw8Jr8/d3zJN+1jnLxEcX5nwXJ58ySGfzp7lk2 yt/y+d+e+wzPV7cN+/lzBkGj/VffNcSWN3CSlNcwA X-Developer-Key: i=ericterminal@gmail.com; a=openpgp; fpr=DDFFBE9D6D4ADA9CD70BC36D8C9DD07C93EDF17F Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" ftgmac100_alloc_rings() allocates rx_skbs, tx_skbs, rxdes, txdes, and rx_scratch in stages. On intermediate failures it returned -ENOMEM directly, leaking resources allocated earlier in the function. Rework the failure path to use staged local unwind labels and free allocated resources in reverse order before returning -ENOMEM. This matches common netdev allocation cleanup style. Fixes: d72e01a0430f ("ftgmac100: Use a scratch buffer for failed RX allocat= ions") Cc: stable@vger.kernel.org Signed-off-by: Yufan Chen --- drivers/net/ethernet/faraday/ftgmac100.c | 28 ++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/drivers/net/ethernet/faraday/ftgmac100.c b/drivers/net/etherne= t/faraday/ftgmac100.c index 1e91e79c8..6d2fe5c2f 100644 --- a/drivers/net/ethernet/faraday/ftgmac100.c +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -977,19 +977,19 @@ static int ftgmac100_alloc_rings(struct ftgmac100 *pr= iv) priv->tx_skbs =3D kcalloc(MAX_TX_QUEUE_ENTRIES, sizeof(void *), GFP_KERNEL); if (!priv->tx_skbs) - return -ENOMEM; + goto err_free_rx_skbs; =20 /* Allocate descriptors */ priv->rxdes =3D dma_alloc_coherent(priv->dev, MAX_RX_QUEUE_ENTRIES * sizeof(struct ftgmac100_rxdes), &priv->rxdes_dma, GFP_KERNEL); if (!priv->rxdes) - return -ENOMEM; + goto err_free_tx_skbs; priv->txdes =3D dma_alloc_coherent(priv->dev, MAX_TX_QUEUE_ENTRIES * sizeof(struct ftgmac100_txdes), &priv->txdes_dma, GFP_KERNEL); if (!priv->txdes) - return -ENOMEM; + goto err_free_rxdes; =20 /* Allocate scratch packet buffer */ priv->rx_scratch =3D dma_alloc_coherent(priv->dev, @@ -997,9 +997,29 @@ static int ftgmac100_alloc_rings(struct ftgmac100 *pri= v) &priv->rx_scratch_dma, GFP_KERNEL); if (!priv->rx_scratch) - return -ENOMEM; + goto err_free_txdes; =20 return 0; + +err_free_txdes: + dma_free_coherent(priv->dev, + MAX_TX_QUEUE_ENTRIES * + sizeof(struct ftgmac100_txdes), + priv->txdes, priv->txdes_dma); + priv->txdes =3D NULL; +err_free_rxdes: + dma_free_coherent(priv->dev, + MAX_RX_QUEUE_ENTRIES * + sizeof(struct ftgmac100_rxdes), + priv->rxdes, priv->rxdes_dma); + priv->rxdes =3D NULL; +err_free_tx_skbs: + kfree(priv->tx_skbs); + priv->tx_skbs =3D NULL; +err_free_rx_skbs: + kfree(priv->rx_skbs); + priv->rx_skbs =3D NULL; + return -ENOMEM; } =20 static void ftgmac100_init_rings(struct ftgmac100 *priv) --=20 2.47.3