[Bug 60852] Random memory corruption reported after writing to /sys/module/drm_kms_helper/parameters/edid_firmware

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=60852

--- Comment #11 from Jani Nikula <jani.nikula at intel.com> ---
Alternatively, please try this patch on top of 3.11, with
CONFIG_FW_LOADER_USER_HELPER=y and the rc.local thing:

diff --git a/drivers/gpu/drm/drm_edid_load.c b/drivers/gpu/drm/drm_edid_load.c
index 271b42b..7a0a1d3 100644
--- a/drivers/gpu/drm/drm_edid_load.c
+++ b/drivers/gpu/drm/drm_edid_load.c
@@ -155,6 +155,13 @@ static u8 *edid_load(struct drm_connector *connector,
const
        err = request_firmware(&fw, name, &pdev->dev);
        platform_device_unregister(pdev);

+       if (err)
+               goto out;
+       else {
+               err = -EINVAL;
+               goto relfw_out;
+       }
+
        if (err) {
                i = 0;
                while (i < GENERIC_EDIDS && strcmp(name, generic_edid_name[i]))

If you can reproduce the issue with this, the problem is in the firmware
loader.

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