From: Shixiong Ou <[email protected]> The scale module parameter can be set to 0 via kernel command line. When scale is 0, scaled_font_h and scaled_font_w become 0, causing a division by zero in the rows/columns calculation.
Since the scale module parameter is read-only (0444 permissions), it cannot be changed at runtime via sysfs. Clamp it to 1 once in drm_log_register(). Signed-off-by: Shixiong Ou <[email protected]> --- v2->v3: Clamp scale once in drm_log_register() instead of introducing a drm_log_scale() helper, since scale is read-only at runtime. v1->v2: Introduce a drm_log_scale() helper. diff --git a/drivers/gpu/drm/clients/drm_log.c b/drivers/gpu/drm/clients/drm_log.c index 294b3be1a6b3..46004abd4e61 100644 --- a/drivers/gpu/drm/clients/drm_log.c +++ b/drivers/gpu/drm/clients/drm_log.c @@ -424,6 +424,9 @@ void drm_log_register(struct drm_device *dev) { struct drm_log *new; + if (!scale) + scale = 1; + new = kzalloc_obj(*new); if (!new) goto err_warn; -- 2.25.1 No virus found Checked by Hillstone Network AntiVirus
