linux-kernel - [PATCH 5.10 002/717] drm/gma500: fix double free of gma

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20201228125021.100600052@linuxfoundation.org>
Date:   Mon, 28 Dec 2020 13:40:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tom Rix <trix@...hat.com>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 002/717] drm/gma500: fix double free of gma_connector

From: Tom Rix <trix@...hat.com>

[ Upstream commit 4e19d51ca5b28a1d435a844c7b2a8e1b1b6fa237 ]

clang static analysis reports this problem:

cdv_intel_dp.c:2101:2: warning: Attempt to free released memory
        kfree(gma_connector);
        ^~~~~~~~~~~~~~~~~~~~

In cdv_intel_dp_init() when the call to cdv_intel_edp_panel_vdd_off()
fails, the handler calls cdv_intel_dp_destroy(connector) which does
the first free of gma_connector. So adjust the goto label and skip
the second free.

Fixes: d112a8163f83 ("gma500/cdv: Add eDP support")
Signed-off-by: Tom Rix <trix@...hat.com>
Signed-off-by: Daniel Vetter <daniel.vetter@...ll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201003193928.18869-1-trix@redhat.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/gma500/cdv_intel_dp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/gma500/cdv_intel_dp.c b/drivers/gpu/drm/gma500/cdv_intel_dp.c
index 720a767118c9c..deb4fd13591d2 100644
--- a/drivers/gpu/drm/gma500/cdv_intel_dp.c
+++ b/drivers/gpu/drm/gma500/cdv_intel_dp.c
@@ -2083,7 +2083,7 @@ cdv_intel_dp_init(struct drm_device *dev, struct psb_intel_mode_device *mode_dev
 			DRM_INFO("failed to retrieve link info, disabling eDP\n");
 			drm_encoder_cleanup(encoder);
 			cdv_intel_dp_destroy(connector);
-			goto err_priv;
+			goto err_connector;
 		} else {
         		DRM_DEBUG_KMS("DPCD: Rev=%x LN_Rate=%x LN_CNT=%x LN_DOWNSP=%x\n",
 				intel_dp->dpcd[0], intel_dp->dpcd[1], 
-- 
2.27.0