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 6E67D1D54EF; Wed, 19 Mar 2025 14:34:13 +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=1742394853; cv=none; b=q+fZkKU88vv4Qo9E0OH6jCu8Sw1poF2b8ZsJmmLQNMRqssBE3XM4R5/iFKdPp0GRbzxhAVPJM1AOgwaamCsQgF2GrxjCAEaVd+aPzItdhxwzecDCritUesDfOtlrp1fktLFIEotvx1HZQ4hYRPQDYNR+zxo48T/kDXFPpgmwW+A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1742394853; c=relaxed/simple; bh=op0fHuWkVAbsTkunmFFnElDJCZ4c/46CQonnWqq+0EA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=JQ40Y4CrB/+KG58JJjXymfjIEjcloC353/FT/jFuiWoPF0iTFkfs6ERUDLWRmdaurwJuu0aHf4s4ZQ5XLnUFcAyvhdpJZRtmRD4I5APrZ8+w0978ifUOsBDEVHiMg3Aik3hh9PgahhksV2Y+setHA/ZM/PuuRf7YoQ/yogZzGlk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=gjdaRwmc; 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="gjdaRwmc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4048CC4CEE4; Wed, 19 Mar 2025 14:34:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1742394853; bh=op0fHuWkVAbsTkunmFFnElDJCZ4c/46CQonnWqq+0EA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gjdaRwmcTTUfg5JxCsGnL7ov6gyQqVRzUi6kdHq0WoxgbqkFe0x7y8RLbPX/ODwNB RPUMUrFdPyjaHZYmbfDq2UvTEJMZLIGdwMafPvTlmgLqV6BtO9qFTzOpK2jj6rtrkv ZpL6d16uui+njsWG60bmtLg9DFdfPl4RGsObU3ro= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Matt Johnston , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.13 023/241] net: mctp i3c: Copy headers if cloned Date: Wed, 19 Mar 2025 07:28:13 -0700 Message-ID: <20250319143028.281741690@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250319143027.685727358@linuxfoundation.org> References: <20250319143027.685727358@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 6.13-stable review patch. If anyone has any objections, please let me know. ------------------ From: Matt Johnston [ Upstream commit 26db9c9ee19c36a97dbb1cfef007a3c189c4c874 ] Use skb_cow_head() prior to modifying the tx skb. This is necessary when the skb has been cloned, to avoid modifying other shared clones. Signed-off-by: Matt Johnston Fixes: c8755b29b58e ("mctp i3c: MCTP I3C driver") Link: https://patch.msgid.link/20250306-matt-i3c-cow-head-v1-1-d5e6a5495227@codeconstruct.com.au Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/mctp/mctp-i3c.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/net/mctp/mctp-i3c.c b/drivers/net/mctp/mctp-i3c.c index c1e72253063b5..c678f79aa3561 100644 --- a/drivers/net/mctp/mctp-i3c.c +++ b/drivers/net/mctp/mctp-i3c.c @@ -506,10 +506,15 @@ static int mctp_i3c_header_create(struct sk_buff *skb, struct net_device *dev, const void *saddr, unsigned int len) { struct mctp_i3c_internal_hdr *ihdr; + int rc; if (!daddr || !saddr) return -EINVAL; + rc = skb_cow_head(skb, sizeof(struct mctp_i3c_internal_hdr)); + if (rc) + return rc; + skb_push(skb, sizeof(struct mctp_i3c_internal_hdr)); skb_reset_mac_header(skb); ihdr = (void *)skb_mac_header(skb); -- 2.39.5