From nobody Fri Dec 19 20:06:51 2025 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 9524D152527; Sun, 24 Mar 2024 23:06:53 +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=1711321614; cv=none; b=J7WnsFQaHxpOaXzxptfrqMNJZFOPprMyHf7nFCGFJxl37Q0VOe99p1RMi4uMMpQW3Q51k0B06rHtm9ApriRJPuUnSqlzIJQvUbmS299xs21sHXLurWQbd5GpkHXqCIvxf4eStB6ZXjSKCJLrAEOunY7nn1YMKXF/F/BKcfq8SGQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711321614; c=relaxed/simple; bh=RwRlzPzxBsXC/idl0YVK+0djdxlWFSHYU/Oc9ReOMuI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=FaqUwWXb9zvwjGp6/og3lgMx0ft3TeV0HTP5TxxArtOvIWsl8kulMkXeGgg4S5+Ga4R1/rLBFVfXWrr5n0mPvS+mTU1TEG3Y6Jpm2SKzUdB9CclJbMykUQJxAbI0g4wtD+IIbFZD+1gzMnjqcrrXRaP7ri4mx184d1y8G3J3UkQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jESuOoYc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jESuOoYc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CFB17C43390; Sun, 24 Mar 2024 23:06:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711321613; bh=RwRlzPzxBsXC/idl0YVK+0djdxlWFSHYU/Oc9ReOMuI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jESuOoYcwaUj3G/h3aDqKH8viwjIM0VwbuIAx5jjemkp7XcGRtZpnXGXK1MzuP1Tx 7TIOv1pNZ79Cs3zj1mI5fDXKsFjMgdgCfjKZQN+jr9p4tkQxM+JhYizjVFXPokT8+e ioZHFX1HWfsa/DG0QTEMsJ+IHSDRZHEOpzoRFJdmo90zQM6eToLiDaw26qiHoYjnlJ Lmf+TlHLCNdjgL2UGZ74pg3Opow6gHTMPaWkbYQfiQYA9/rJ6BZXYk0qjAcRIYwrnH BhP2sauM4vmji8z1ZM3xzh3sm6/fR8E4SVBMxL0OKt69/fbEdLgCTvmR7pk6BzYQGK ecAic+c1NdBHg== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Chen Ni , Thierry Reding , Sasha Levin Subject: [PATCH 6.6 343/638] drm/tegra: dsi: Add missing check for of_find_device_by_node Date: Sun, 24 Mar 2024 18:56:20 -0400 Message-ID: <20240324230116.1348576-344-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240324230116.1348576-1-sashal@kernel.org> References: <20240324230116.1348576-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Chen Ni [ Upstream commit afe6fcb9775882230cd29b529203eabd5d2a638d ] Add check for the return value of of_find_device_by_node() and return the error if it fails in order to avoid NULL pointer dereference. Fixes: e94236cde4d5 ("drm/tegra: dsi: Add ganged mode support") Signed-off-by: Chen Ni Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20231024080738.825553-1= -nichen@iscas.ac.cn Signed-off-by: Sasha Levin --- drivers/gpu/drm/tegra/dsi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/tegra/dsi.c b/drivers/gpu/drm/tegra/dsi.c index a9870c8283749..4101b2e012118 100644 --- a/drivers/gpu/drm/tegra/dsi.c +++ b/drivers/gpu/drm/tegra/dsi.c @@ -1543,9 +1543,11 @@ static int tegra_dsi_ganged_probe(struct tegra_dsi *= dsi) np =3D of_parse_phandle(dsi->dev->of_node, "nvidia,ganged-mode", 0); if (np) { struct platform_device *gangster =3D of_find_device_by_node(np); + of_node_put(np); + if (!gangster) + return -EPROBE_DEFER; =20 dsi->slave =3D platform_get_drvdata(gangster); - of_node_put(np); =20 if (!dsi->slave) { put_device(&gangster->dev); --=20 2.43.0