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 E00712264A3; Fri, 4 Sep 2026 05:41:41 +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=1788500503; cv=none; b=I0phdSz0QKv88Vto/33gibRkAQ7czuam7RhK18bpo+K6WohMN7YCLfZ6k+0abXrYeIknn1vNNs15rUK0kjIn2f1jhoYuMQARb+4dhm0bQaBw3GktZ623q2IP3XKNjbfIBycHTJbGYSxSazxcQonilyQ86wimKdQ6UkJybQFVY3k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1788500503; c=relaxed/simple; bh=LaMCHyfHkfT0Bi24OexJFxhgvpSdkMVbq6AGBmkwRNo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eP6gfLPLZqluNa3Cbqt+N7zvfsMAO0qpyjEBCgxRHsXURh6TEV76IIMVx4jPuITpVIdTKh0rMnywcLxKZr3PqNCvzmdIhuqDGTBIAYh3OF2XJOk3QO3QJguJVNCCvm/vK4db5xY+XfIDITo0YxkmcSj7EMhxrbEEtD4tVm/7z+8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=G9JFWABj; 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="G9JFWABj" Received: by smtp.kernel.org (Postfix) with ESMTPSA id ED8ED1F00A3D; Fri, 4 Sep 2026 05:41:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1788500501; bh=hk34o49HNlQvQSoItalMUHI1TB0lWw3PBp0eiXC9stE=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=G9JFWABjaUXrmNfmDIovsMhhkgfA2hwozk7XNjyCAOU2WP/Yb4PZX2Rbsaz+/OMW7 Vw3Otw3xTGkKg97r3CMtPRexFlJjxWbTIkc9NF8b0/XD7IBr+EFrrcQ7ZNHlf88TFK HyPg2n5cfHhZX+Ir5r87ksNwvcaw+SkqPP9iEYfw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+eaa106d192c9daf37f95@syzkaller.appspotmail.com, Joshua Crofts Subject: [PATCH 6.18 080/552] usb: gadget: midi2: remove default configfs groups on teardown Date: Fri, 4 Sep 2026 06:53:57 +0200 Message-ID: <20260904045749.679532806@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260904045747.813364717@linuxfoundation.org> References: <20260904045747.813364717@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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Joshua Crofts commit 0f6bffb5008f0cba9cad5ded2caccc64466a6e54 upstream. f_midi2_alloc_inst() creates default configfs child groups for the default endpoint and default block using configfs_add_default_group(), setting their internal refcount to 1. However, during function teardown in f_midi2_free_inst() or EP cleanup in f_midi2_ep_opts_release(), configfs_remove_default_groups() is never called, therefore never dropping the refcount and leaking struct f_midi2_ep_opts and f_midi2_block_opts. Add the missing configfs_remove_default_groups() in the afformentioned functions to free the structs properly. Fixes: 8b645922b223 ("usb: gadget: Add support for USB MIDI 2.0 function driver") Cc: stable@vger.kernel.org Reported-by: syzbot+eaa106d192c9daf37f95@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=eaa106d192c9daf37f95 Tested-by: syzbot+eaa106d192c9daf37f95@syzkaller.appspotmail.com Signed-off-by: Joshua Crofts Link: https://patch.msgid.link/20260730135811.1498-1-joshua.crofts1@gmail.com Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/f_midi2.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/usb/gadget/function/f_midi2.c +++ b/drivers/usb/gadget/function/f_midi2.c @@ -2474,6 +2474,7 @@ static void f_midi2_ep_opts_release(stru { struct f_midi2_ep_opts *opts = to_f_midi2_ep_opts(item); + configfs_remove_default_groups(&opts->group); kfree(opts->info.ep_name); kfree(opts->info.product_id); kfree(opts); @@ -2640,6 +2641,7 @@ static void f_midi2_free_inst(struct usb opts = container_of(f, struct f_midi2_opts, func_inst); + configfs_remove_default_groups(&opts->func_inst.group); kfree(opts->info.iface_name); kfree(opts); }