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 96B6A376BCD; Sat, 12 Sep 2026 13:28:52 +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=1789219733; cv=none; b=MglD3gUzeN6BNgrQeZ9nEUe8pzEZi104WH6IKXugX5F2ZY5Is59aDt4bIquoNOEZtY9DkxAHzZ3ouU7cE1RWX0D+58IVV/DtI0GXdA47hfnYFp43dbvhEe+c0s9MuwWzCqhXfnJWTE2mCnNf8mfDnAqc9GhZfMi+dxAJlC6KUu4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789219733; c=relaxed/simple; bh=LV2xsdchtS8Yr9xOG+OWh6g3GyVvfErP0WLKx/NddwA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CHafHdHHgVfkkyddDWgUL/psx20vaMiYdmJ27hh3lLjQ4R6nHVudFCO/ZF5RSREXw8liez3iqQWnRrpNl+hf8+eJj5I25zAY1rR5icfktxZOVm5w0nMnWHK0tOCjT2ikMq/WbDzMlcHkG5LaLUy8CNcqavRqpa8O3zZ+TiyyujM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=kaoXA2FO; 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="kaoXA2FO" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22E531F000FF; Sat, 12 Sep 2026 13:28:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789219732; bh=xrajmEC3XPPkQLShBhlXrycS+BUZdcPXI8Xon0m4ALU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=kaoXA2FO8345TmFLfzM6PprRMMAtyXTPqp1ewUf8Vu2XZ1NCP9wiEBQPjKssEQ7wG Qz0iqV1PuhRkl/LOoBIl++mzCfIZy8k/OmzK/VJOoyF9CxZxBo9Tl0vYzG1X0Sl2H8 id1cXME599xlHckfueizXO7u4D359j1aOtEGsJoY= 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 6.6 0034/1424] usb: gadget: midi2: remove default configfs groups on teardown Date: Sat, 12 Sep 2026 08:41:06 +0200 Message-ID: <20260912065608.069478062@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.279695368@linuxfoundation.org> References: <20260912065607.279695368@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 6.6-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 @@ -2476,6 +2476,7 @@ 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); @@ -2642,6 +2643,7 @@ 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); }