From patchwork Tue Nov 5 11:02:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Biju Das X-Patchwork-Id: 13862799 X-Patchwork-Delegate: kieran@bingham.xyz Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A5E0C2B9B7; Tue, 5 Nov 2024 11:03:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.160.252.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730804584; cv=none; b=fxaCl1eFon+YMOJeoM3K0tFP62IsobywM3LBRNoizVat2v5JS/ak4yYts0P8uBa59wRCSwhgoQvCFIksv3BwslOrijcqGOV2LeLS+c+rxafr+iasL9c1pAohdh5VK7OSkuPQAXXjChtdto8R2abbRVwaPJ4fi66BbxHad3RdQHo= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730804584; c=relaxed/simple; bh=yPeUkJCbvdwwQz/OPfobK9IK2pLrEQtiFx2Gagib1zs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=HIiDR8hOVnhsynH8ZP6Df8bRpdg3fjjdCXISukDU3uyzPM14BOAkk4Vhssnzi8JDf2hizNdIoGqeFZQr1hyEUKXzMDacoMrJxAnT7oFjjKz6XncYzua6VtkC9KmmYvhOLzNN4cY/fIUfpXQW8gS0v2I16nS6VCiUwBtvb3nmvzY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=bp.renesas.com; spf=pass smtp.mailfrom=bp.renesas.com; arc=none smtp.client-ip=210.160.252.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=bp.renesas.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bp.renesas.com X-IronPort-AV: E=Sophos;i="6.11,259,1725289200"; d="scan'208";a="227918962" Received: from unknown (HELO relmlir6.idc.renesas.com) ([10.200.68.152]) by relmlie6.idc.renesas.com with ESMTP; 05 Nov 2024 20:03:00 +0900 Received: from localhost.localdomain (unknown [10.226.92.174]) by relmlir6.idc.renesas.com (Postfix) with ESMTP id EF35641CF64B; Tue, 5 Nov 2024 20:02:44 +0900 (JST) From: Biju Das To: Andrzej Hajda , Neil Armstrong , Robert Foss , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: Biju Das , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Archit Taneja , dri-devel@lists.freedesktop.org, Geert Uytterhoeven , Prabhakar Mahadev Lad , Biju Das , stable@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: [PATCH 1/2] drm: adv7511: Fix use-after-free in adv7533_attach_dsi() Date: Tue, 5 Nov 2024 11:02:27 +0000 Message-ID: <20241105110236.112631-2-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241105110236.112631-1-biju.das.jz@bp.renesas.com> References: <20241105110236.112631-1-biju.das.jz@bp.renesas.com> Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The host_node pointer assigned and freed in adv7533_parse_dt() and later adv7533_attach_dsi() uses the same. Fix this issue by freeing the host_node in adv7533_attach_dsi() instead of adv7533_parse_dt(). Fixes: 1e4d58cd7f88 ("drm/bridge: adv7533: Create a MIPI DSI device") Signed-off-by: Biju Das --- drivers/gpu/drm/bridge/adv7511/adv7533.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/adv7511/adv7533.c b/drivers/gpu/drm/bridge/adv7511/adv7533.c index 4481489aaf5e..3e57ba838e5e 100644 --- a/drivers/gpu/drm/bridge/adv7511/adv7533.c +++ b/drivers/gpu/drm/bridge/adv7511/adv7533.c @@ -133,6 +133,7 @@ int adv7533_patch_cec_registers(struct adv7511 *adv) int adv7533_attach_dsi(struct adv7511 *adv) { + struct device_node *np __free(device_node) = adv->host_node; struct device *dev = &adv->i2c_main->dev; struct mipi_dsi_host *host; struct mipi_dsi_device *dsi; @@ -181,8 +182,6 @@ int adv7533_parse_dt(struct device_node *np, struct adv7511 *adv) if (!adv->host_node) return -ENODEV; - of_node_put(adv->host_node); - adv->use_timing_gen = !of_property_read_bool(np, "adi,disable-timing-generator");