From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 1D12927B320; Mon, 22 Sep 2025 19:35:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758569740; cv=none; b=aJiCpa40wwhKwWQcbFFZIRmZjScIASvoKncF6tr5nepOsz2FDZdGbhWIJONo5SHYrKrJ93J4gQtQmA/fK+dgRFuaQm4yXFaYp587E32pC8GsFM8v2Z6i8a3p+kBspoCob7jAP+ZL0WtAvqs+Ydu58Xf1axs2vq5cO3qU2v2rvy4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758569740; c=relaxed/simple; bh=RTUZwhcPe+jmMiD0l67l41IpfSgeliBCvQkp+VabuI4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GCbdDPurOKs1KB9obiDw8AbDX0281mnxY2xfa/TD+YbTkcQMZ7N7T9OfMBXUJqvh476og7pGMO5PzhsJ+XKpifUOpUYDvquR8rJQoQJGw1iLa19jNb/Q6iaqparpLjD2xn/XVtnXrlt0Cwq+6/2rY1Jx/slS0fSTi9EoaZzSUoA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=2Mam6kcw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="2Mam6kcw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AA34AC4CEF0; Mon, 22 Sep 2025 19:35:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1758569740; bh=RTUZwhcPe+jmMiD0l67l41IpfSgeliBCvQkp+VabuI4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2Mam6kcwYtZINgsraCVfjEk8HhhqIW/l46zTfJcrTxf1H7pE4Fm8XLIGUvDipNCjb i6HxOpaJpS8479HbWTfsJ71/r73kBZtiLiSaoR0Vnwbl6ykxktPP/pmtEi4drpy3gZ 2TiSBjPNFzXQ1LvWlwPVSqnbSeSJVfWp7UnqGjLA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Heikki Krogerus , Hans de Goede , Johannes Berg Subject: [PATCH 6.6 42/70] net: rfkill: gpio: Fix crash due to dereferencering uninitialized pointer Date: Mon, 22 Sep 2025 21:29:42 +0200 Message-ID: <20250922192405.746172092@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20250922192404.455120315@linuxfoundation.org> References: <20250922192404.455120315@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org 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: Hans de Goede commit b6f56a44e4c1014b08859dcf04ed246500e310e5 upstream. Since commit 7d5e9737efda ("net: rfkill: gpio: get the name and type from device property") rfkill_find_type() gets called with the possibly uninitialized "const char *type_name;" local variable. On x86 systems when rfkill-gpio binds to a "BCM4752" or "LNV4752" acpi_device, the rfkill->type is set based on the ACPI acpi_device_id: rfkill->type = (unsigned)id->driver_data; and there is no "type" property so device_property_read_string() will fail and leave type_name uninitialized, leading to a potential crash. rfkill_find_type() does accept a NULL pointer, fix the potential crash by initializing type_name to NULL. Note likely sofar this has not been caught because: 1. Not many x86 machines actually have a "BCM4752"/"LNV4752" acpi_device 2. The stack happened to contain NULL where type_name is stored Fixes: 7d5e9737efda ("net: rfkill: gpio: get the name and type from device property") Cc: stable@vger.kernel.org Cc: Heikki Krogerus Signed-off-by: Hans de Goede Reviewed-by: Heikki Krogerus Link: https://patch.msgid.link/20250913113515.21698-1-hansg@kernel.org Signed-off-by: Johannes Berg Signed-off-by: Greg Kroah-Hartman --- net/rfkill/rfkill-gpio.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/net/rfkill/rfkill-gpio.c +++ b/net/rfkill/rfkill-gpio.c @@ -79,10 +79,10 @@ static int rfkill_gpio_acpi_probe(struct static int rfkill_gpio_probe(struct platform_device *pdev) { struct rfkill_gpio_data *rfkill; - struct gpio_desc *gpio; + const char *type_name = NULL; const char *name_property; const char *type_property; - const char *type_name; + struct gpio_desc *gpio; int ret; rfkill = devm_kzalloc(&pdev->dev, sizeof(*rfkill), GFP_KERNEL);