From: Chris Wilson Date: Tue, 13 Mar 2018 11:31:49 +0000 Subject: drm/i915: Use sseu size for determining eu_regs[] Git-commit: c7fb3c6c1893fddbbd39e13066489050c29397c1 Patch-mainline: v4.18-rc1 References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166 eu_regs[] is written 2*max_slices times (like s_reg[]) but oddly read 2*max_slices + max_subslices/2 times. Allocate the array large enough for the writes to avoid overwriting our stack and worry about the logic later. Fixes: 7aa0b14ede64 ("drm/i915: Remove variable length arrays from sseu debugfs printers") Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=105479 Signed-off-by: Chris Wilson Cc: Lionel Landwerlin Cc: Tvrtko Ursulin Cc: Matthew Auld Reviewed-by: Lionel Landwerlin Link: https://patchwork.freedesktop.org/patch/msgid/20180313113149.1094-1-chris@chris-wilson.co.uk Acked-by: Petr Tesarik --- drivers/gpu/drm/i915/i915_debugfs.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) --- a/drivers/gpu/drm/i915/i915_debugfs.c +++ b/drivers/gpu/drm/i915/i915_debugfs.c @@ -4344,8 +4344,9 @@ static void cherryview_sseu_device_statu static void gen10_sseu_device_status(struct drm_i915_private *dev_priv, struct sseu_dev_info *sseu) { +#define SS_MAX 6 const struct intel_device_info *info = INTEL_INFO(dev_priv); - u32 s_reg[6], eu_reg[2 * 4], eu_mask[2]; + u32 s_reg[SS_MAX], eu_reg[2 * SS_MAX], eu_mask[2]; int s, ss; for (s = 0; s < info->sseu.max_slices; s++) { @@ -4393,13 +4394,15 @@ static void gen10_sseu_device_status(str eu_cnt); } } +#undef SS_MAX } static void gen9_sseu_device_status(struct drm_i915_private *dev_priv, struct sseu_dev_info *sseu) { +#define SS_MAX 3 const struct intel_device_info *info = INTEL_INFO(dev_priv); - u32 s_reg[3], eu_reg[2 * 4], eu_mask[2]; + u32 s_reg[SS_MAX], eu_reg[2 * SS_MAX], eu_mask[2]; int s, ss; for (s = 0; s < info->sseu.max_slices; s++) { @@ -4447,6 +4450,7 @@ static void gen9_sseu_device_status(stru eu_cnt); } } +#undef SS_MAX } static void broadwell_sseu_device_status(struct drm_i915_private *dev_priv,