From patchwork Tue Jul 23 13:32:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ma Ke X-Patchwork-Id: 13740054 Received: from cstnet.cn (smtp84.cstnet.cn [159.226.251.84]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8EDF0208A0; Tue, 23 Jul 2024 13:33:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.84 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721741586; cv=none; b=ix3FYQ9Bn1t5G/Iu6dyNozm0JPf/Qn2PrEVp+R5hikaC+ygHyRxUEfeXnHicY91QRvOL6rCKtm1Dir0lNqmRIrA+G8/clfn6kSpR/22gDorl6/LVYjsV7uwHvg3GPvJ4OLes/yqeAUsakvTjXLB1iTRCbGvFNr4o51ZxsvCqYzw= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721741586; c=relaxed/simple; bh=vmhHHcC3WZiFq+EgmtM70e1+5EcqoRGLgNcKEJZqJxs=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=btEwLjz5UljAFv+t2jf7YHZlDjUA0626EwcIERiqL0M7RiOpWcHEbhdIRYz8jJssLOETTrP4rcEvG8Kurbu5zkswIjD4LI1CZolOppMIYo7YY0Jef/arkDpDtd+jwKBkSOKj+jEyAE6gszCrzABOHR5JGrHXVMnHEMzHhQjRbSM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.84 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from icess-ProLiant-DL380-Gen10.. (unknown [183.174.60.14]) by APP-05 (Coremail) with SMTP id zQCowABXhUHxsJ9mkCCQAA--.4469S2; Tue, 23 Jul 2024 21:32:44 +0800 (CST) From: Ma Ke To: heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org, make24@iscas.ac.cn, dmitry.baryshkov@linaro.org, bleung@chromium.org, utkarsh.h.patel@intel.com, abhishekpandit@chromium.org, kyletso@google.com Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] usb: typec: ucsi: Fix NULL pointer dereference in ucsi_displayport_vdm() Date: Tue, 23 Jul 2024 21:32:30 +0800 Message-Id: <20240723133230.1325392-1-make24@iscas.ac.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: zQCowABXhUHxsJ9mkCCQAA--.4469S2 X-Coremail-Antispam: 1UD129KBjvdXoWrKw1rXry7Gr45tF4DKryDZFb_yoWDJrg_A3 Wv9wnrWF1jkFyq9r15ta4a9rWFkay0v3WIqFn3t3s5CF129F1xXrWUXrs3XFyfuF45uF9x Cr1jkryxuw4DGjkaLaAFLSUrUUUUjb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUIcSsGvfJTRUUUbfkFF20E14v26r4j6ryUM7CY07I20VC2zVCF04k26cxKx2IYs7xG 6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rwA2F7IY1VAKz4vEj48ve4kI8w A2z4x0Y4vE2Ix0cI8IcVAFwI0_JFI_Gr1l84ACjcxK6xIIjxv20xvEc7CjxVAFwI0_Gr0_ Cr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I8E87Iv6xkF7I0E14v26rxl6s 0DM2vYz4IE04k24VAvwVAKI4IrM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI 64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r1j6r18McIj6I8E87Iv67AKxVWUJVW8Jw Am72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lF7I21c0EjII2zVCS5cI20VAG YxC7M4IIrI8v6xkF7I0E8cxan2IY04v7MxkF7I0En4kS14v26r1q6r43MxAIw28IcxkI7V AKI48JMxC20s026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCj r7xvwVAFwI0_JrI_JrWlx4CE17CEb7AF67AKxVWUtVW8ZwCIc40Y0x0EwIxGrwCI42IY6x IIjxv20xvE14v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwCI42IY6xAI w20EY4v20xvaj40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x 0267AKxVWUJVW8JbIYCTnIWIevJa73UjIFyTuYvjfUOmhFUUUUU X-CM-SenderInfo: ppdnvj2u6l2u1dvotugofq/ When dp->con->partner is an error, a NULL pointer dereference may occur. Add a check for dp->con->partner to avoid dereferencing a NULL pointer. Fixes: 372adf075a43 ("usb: typec: ucsi: Determine common SVDM Version") Signed-off-by: Ma Ke --- drivers/usb/typec/ucsi/displayport.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/displayport.c index 420af5139c70..eb7d3f97940a 100644 --- a/drivers/usb/typec/ucsi/displayport.c +++ b/drivers/usb/typec/ucsi/displayport.c @@ -222,6 +222,8 @@ static int ucsi_displayport_vdm(struct typec_altmode *alt, switch (cmd_type) { case CMDT_INIT: if (PD_VDO_SVDM_VER(header) < svdm_version) { + if (IS_ERR_OR_NULL(dp->con->parter)) + break; typec_partner_set_svdm_version(dp->con->partner, PD_VDO_SVDM_VER(header)); svdm_version = PD_VDO_SVDM_VER(header); }