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 0294925FA13; Tue, 8 Apr 2025 11:41:43 +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=1744112503; cv=none; b=oXVXm6WDoU+r7OqOPRvNwgr9ZbbqB5L2ivt3fGcii965d4gNmPuOvkwEsOBgASOh2v1MKFCx3EBAEV0vJ4as46E8WAYv3fSnRoodEAILRNY05HF/1T//9TzQX+NiaPPiGZ3peXQTwIhIRt7nNCNRQUfXgSL8tME1Vu6J7jTduUM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744112503; c=relaxed/simple; bh=86OBg5Lk28xeBNar22JHP706luZoebYF2ZIcXjk5SDk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=S8fOzdSdS51d63cwtwobq5mWeqcMW2iYDM4t7OLTOAISzTfzEMUVAqJdJ7D6zS+wB10nm/fnivQxfA9M+pFFTBT7G/Rc+ij1yfjWZMK3EqcFpu7aiU9sVxOqw9FeCjt97FYpdQunw8+YquaTE+9PMnJGtueMt2a8J1NSha6gLqE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zeBgDGf9; 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="zeBgDGf9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8819DC4CEE5; Tue, 8 Apr 2025 11:41:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744112502; bh=86OBg5Lk28xeBNar22JHP706luZoebYF2ZIcXjk5SDk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zeBgDGf9+ntGVKYYLj1aswqBrfG811Eq1uxwJTeYMBfqpOPhIXwDO3Mi0dsTbjBNM AKMV/A8EFr7R+B8/IBIi/paVEcl9awrM93emF/r1P0oJpOmX+rhAIUHjrv/0tpRv7G 9Le6K4iP8+EwgtuIOw93/mOJl2gbFYC1Hz66jncQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Dan Carpenter , Simon Horman , Paolo Abeni , Sasha Levin Subject: [PATCH 5.15 093/279] net: atm: fix use after free in lec_send() Date: Tue, 8 Apr 2025 12:47:56 +0200 Message-ID: <20250408104828.865794424@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104826.319283234@linuxfoundation.org> References: <20250408104826.319283234@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org 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: Dan Carpenter [ Upstream commit f3009d0d6ab78053117f8857b921a8237f4d17b3 ] The ->send() operation frees skb so save the length before calling ->send() to avoid a use after free. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Dan Carpenter Reviewed-by: Simon Horman Link: https://patch.msgid.link/c751531d-4af4-42fe-affe-6104b34b791d@stanley.mountain Signed-off-by: Paolo Abeni Signed-off-by: Sasha Levin --- net/atm/lec.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/atm/lec.c b/net/atm/lec.c index 7226c784dbe0c..ca9952c52fb5c 100644 --- a/net/atm/lec.c +++ b/net/atm/lec.c @@ -181,6 +181,7 @@ static void lec_send(struct atm_vcc *vcc, struct sk_buff *skb) { struct net_device *dev = skb->dev; + unsigned int len = skb->len; ATM_SKB(skb)->vcc = vcc; atm_account_tx(vcc, skb); @@ -191,7 +192,7 @@ lec_send(struct atm_vcc *vcc, struct sk_buff *skb) } dev->stats.tx_packets++; - dev->stats.tx_bytes += skb->len; + dev->stats.tx_bytes += len; } static void lec_tx_timeout(struct net_device *dev, unsigned int txqueue) -- 2.39.5