From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 377FA2D5A19; Mon, 13 Apr 2026 16:38:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776098339; cv=none; b=aIs3+A8xtCHtoQdPGvrotaEkhKAQDpxZhUIMm5wjPQkZ0qigmuJmPe5BOsNl3ESQroBm3nEe34bSnVEICuPGclUtgK13mBj6fqh/ayYDhS9paTXrrp73wJanJUFlyH8l1TPwb1bKfhKLXZM56M9Z8Vz5KJ7zWO8CI1shB618urQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776098339; c=relaxed/simple; bh=Ioqb7tM081lcuO/QtxeKP+63Yt/mmuYO+lpH7d4ViJA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Oml+B9UOiixca8FRc9fwAL95NrOhKTFRKIXMeZ9rlRc4sEeMuIjdIgAFNsX97cB3Oe69hGYJq4HcnRNfChSVQMHPdmMIs+5uXIIKY0r4eElZ70JaXyPcq8LUj2W+xaxlk0PGvIcDSnW8op4daoZL3YUQYl0bxrhTE7VkEnv2j94= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=e9D0lOSM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="e9D0lOSM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C1F61C2BCAF; Mon, 13 Apr 2026 16:38:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776098339; bh=Ioqb7tM081lcuO/QtxeKP+63Yt/mmuYO+lpH7d4ViJA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=e9D0lOSMfKng/xqQRjSyhW0SOMIl6wtdkPPMejxErlAc/cVGvSFsAIdI+DHZPT461 1HLvjUc8ee9+y4UbhKaMdR+6EBi9Na/zXsAinnEn5QfyiOqCvTsDvCAzIHROuEE6D9 eD0XT63qsVdNxvoFOBudXjFYjkymAzCzGQcp4UVI= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Yufan Chen , Jakub Kicinski Subject: [PATCH 5.15 487/570] net: ftgmac100: fix ring allocation unwind on open failure Date: Mon, 13 Apr 2026 18:00:18 +0200 Message-ID: <20260413155848.699284672@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260413155830.386096114@linuxfoundation.org> References: <20260413155830.386096114@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Yufan Chen commit c0fd0fe745f5e8c568d898cd1513d0083e46204a upstream. 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 allocations") Cc: stable@vger.kernel.org Signed-off-by: Yufan Chen Link: https://patch.msgid.link/20260328163257.60836-1-yufan.chen@linux.dev Signed-off-by: Jakub Kicinski Signed-off-by: Greg Kroah-Hartman --- drivers/net/ethernet/faraday/ftgmac100.c | 28 ++++++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) --- a/drivers/net/ethernet/faraday/ftgmac100.c +++ b/drivers/net/ethernet/faraday/ftgmac100.c @@ -931,19 +931,19 @@ static int ftgmac100_alloc_rings(struct priv->tx_skbs = kcalloc(MAX_TX_QUEUE_ENTRIES, sizeof(void *), GFP_KERNEL); if (!priv->tx_skbs) - return -ENOMEM; + goto err_free_rx_skbs; /* Allocate descriptors */ priv->rxdes = 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 = 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; /* Allocate scratch packet buffer */ priv->rx_scratch = dma_alloc_coherent(priv->dev, @@ -951,9 +951,29 @@ static int ftgmac100_alloc_rings(struct &priv->rx_scratch_dma, GFP_KERNEL); if (!priv->rx_scratch) - return -ENOMEM; + goto err_free_txdes; 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 = NULL; +err_free_rxdes: + dma_free_coherent(priv->dev, + MAX_RX_QUEUE_ENTRIES * + sizeof(struct ftgmac100_rxdes), + priv->rxdes, priv->rxdes_dma); + priv->rxdes = NULL; +err_free_tx_skbs: + kfree(priv->tx_skbs); + priv->tx_skbs = NULL; +err_free_rx_skbs: + kfree(priv->rx_skbs); + priv->rx_skbs = NULL; + return -ENOMEM; } static void ftgmac100_init_rings(struct ftgmac100 *priv)