[PATCH 5.4 69/81] drm/gma500: Fix null dereference in hdmi teardown

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

5.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Zabelin Nikita <n.zabelin@mt-integration.ru>

[ Upstream commit 352e66900cde63f3dadb142364d3c35170bbaaff ]

pci_set_drvdata sets the value of pdev->driver_data to NULL,
after which the driver_data obtained from the same dev is
dereferenced in oaktrail_hdmi_i2c_exit, and the i2c_dev is
extracted from it. To prevent this, swap these calls.

Found by Linux Verification Center (linuxtesting.org) with Svacer.

Fixes: 1b082ccf5901 ("gma500: Add Oaktrail support")
Signed-off-by: Zabelin Nikita <n.zabelin@mt-integration.ru>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://lore.kernel.org/r/20250918150703.2562604-1-n.zabelin@mt-integration.ru
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/gma500/oaktrail_hdmi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/gma500/oaktrail_hdmi.c b/drivers/gpu/drm/gma500/oaktrail_hdmi.c
index f4c520893ceb6..93a0a791b8c38 100644
--- a/drivers/gpu/drm/gma500/oaktrail_hdmi.c
+++ b/drivers/gpu/drm/gma500/oaktrail_hdmi.c
@@ -741,8 +741,8 @@ void oaktrail_hdmi_teardown(struct drm_device *dev)
 
 	if (hdmi_dev) {
 		pdev = hdmi_dev->dev;
-		pci_set_drvdata(pdev, NULL);
 		oaktrail_hdmi_i2c_exit(pdev);
+		pci_set_drvdata(pdev, NULL);
 		iounmap(hdmi_dev->regs);
 		kfree(hdmi_dev);
 		pci_dev_put(pdev);
-- 
2.51.0