From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 597E03B2FE4; Fri, 4 Sep 2026 05:09:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788498591; cv=none; b=EFAIAFW4Q5Ov4veYgws5DpO98WaMGWFUWoW+NSULiKzUDLbLXYA/vr2MYQHnCp1iNLyrjrQJq7fUexsTIBSyMmEseAbJniUXDaVRv3EPZ4gaUw0Hs0AhFqkbZqDhxlmGmai+fGGaHASsGuUmPl8a5bt61k3YLiLwSMVErdDVbek= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788498591; c=relaxed/simple; bh=60NI+L/dQR4KUFaKuKZz3P3uDeiiHzyNJH/HFmFRkOg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=e08gAH/SXxTqg6iO2NxHZIvXWa9apkdczSC6cKL+zbFPEA4ueaTvVp8t5XTIsaC+NMejUZTpV8kNiWqRaQLKE0HKwWGP8ItzwX8K4Gk1Iw4Yb2mlJCiKDjCwYoZiy9I7rVxhI9HX656OpOLvLWNe+RC49VE+ainIW6sLuF20yr8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=id1OQgMM; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="id1OQgMM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B36CB1F00A3D; Fri, 4 Sep 2026 05:09:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788498590; bh=alteO2xHgHgcM6Lb76xZdKpwWemhTZJ1S2TtrNAG3fc=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=id1OQgMMIONWpunFdZgA8ohaq+b1WKLBjF1jmMWPZQWtO550U4c+MV8Zc1e1DmTZq 4oB1tixZgA4K8SUDWMXkvQ4X5qjc7nezBizusBR2A9PAfAI6VHOXW9HTxcojKi0umq 6cyeBO6oN/ZU+244KN2frDTNBlbsAgclBwWFNV8U= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+de553c19cb054f174a35@syzkaller.appspotmail.com, Jeffin Philip Subject: [PATCH 7.2 116/713] usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() Date: Fri, 4 Sep 2026 06:51:24 +0200 Message-ID: <20260904045806.438257577@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904045803.810145556@linuxfoundation.org> References: <20260904045803.810145556@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 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jeffin Philip commit bdab5605259ba5d6ff927c1a85cc83eb3ecfdacc upstream. In uvc_function_bind() error path, we use usb_ep_free_request which uses uvc->control_req but does not set it to NULL afterwards. Thus, uvc->control_req is a dangling pointer causing a UAF. Also we do not set the uvc->control_buf pointer to NULL after freeing it, which is another dangling pointer. Fix it by setting uvc->control_req to NULL after we run usb_ep_free_request() and uvc->control_buf to NULL after kfree. Do the same for uvc_function_unbind(). Reported-by: syzbot+de553c19cb054f174a35@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=de553c19cb054f174a35 Fixes: 0f9df9393855 ("usb: gadget: uvc: fix error path in uvc_function_bind()") Fixes: 6d11ed76c45d ("usb: gadget: f_uvc: convert f_uvc to new function interface") Cc: stable@vger.kernel.org Signed-off-by: Jeffin Philip Link: https://patch.msgid.link/20260813174311.130823-1-jeffinphilip14@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/f_uvc.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/usb/gadget/function/f_uvc.c +++ b/drivers/usb/gadget/function/f_uvc.c @@ -889,9 +889,12 @@ error_unlock: v4l2_error: v4l2_device_unregister(&uvc->v4l2_dev); error: - if (uvc->control_req) + if (uvc->control_req) { usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); + uvc->control_req = NULL; + } kfree(uvc->control_buf); + uvc->control_buf = NULL; usb_free_all_descriptors(f); return ret; @@ -1075,7 +1078,9 @@ static void uvc_function_unbind(struct u uvc->vdev_release_done = NULL; usb_ep_free_request(cdev->gadget->ep0, uvc->control_req); + uvc->control_req = NULL; kfree(uvc->control_buf); + uvc->control_buf = NULL; usb_free_all_descriptors(f); }