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 530FB39150B; Sat, 12 Sep 2026 17:01:31 +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=1789232492; cv=none; b=i8Keyks0seceHdQzlMkzwCueRxQVty/MFOIYEg68ezJC8wTlrpwM752vuu04D7adtJ1CYopFVNwLUI7JwFkcfcy/n9oqw29BTjsOfFwzJ1DBIjujfzZg4K9vxVz/f47xlD+3q/+OBZEYnJ+yJ8poGbJAFswnReLzDy/2Q4RAI44= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789232492; c=relaxed/simple; bh=ccEXIj7C98lM2tGoT4Fl5DG/KrpHc56xCW+itua0EYw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BHhRA603FaFeCPn6CT2AYkNUTWqZzkih6ifRvdPh9kjbTb9to6E8T+RiZ5BcoJyk+BPe29ZQ4cGBRzCBwMKEG/nul0xzaCC2E257ymc7X3shUCZEE1jFkx6atlTeEUU1cwW8DTSrICrnoGvvhgiu52vAHNZM+LQM54+iv2nYNHE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Hzgd7KbD; 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="Hzgd7KbD" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 274F11F000FF; Sat, 12 Sep 2026 17:01:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789232491; bh=ASgPp9WiawmktGRWO9xNszN2L0Wtr6fcVpeSe0FDGDg=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Hzgd7KbDBPwuA3ot5kH6VKl2zS9qIg9whJxZems7/FpI2ma3lNk16YegA0WmkhsS2 x0nMXwi0hYrvFSe+ydlRxoB5Ri3r36VAA+/kP+7EwsO5ZRraOuG4nZ1tm2HMmA1Vpl /TsX83GTCEXvDPhWqCn+ZV9fj9xgwQB0CymI16J4= 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 5.15 021/935] usb: gadget: uvc: fix dangling pointers in uvc_function_bind() and uvc_function_unbind() Date: Sat, 12 Sep 2026 08:50:51 +0200 Message-ID: <20260912065527.325047412@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065526.833703348@linuxfoundation.org> References: <20260912065526.833703348@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: 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 @@ -781,9 +781,12 @@ uvc_function_bind(struct usb_configurati 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; @@ -958,7 +961,9 @@ 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); }