From: Dan Carpenter Date: Mon, 24 Jan 2022 12:24:09 +0000 (+0300) Subject: drm/i915/overlay: Prevent divide by zero bugs in scaling X-Git-Tag: microblaze-v5.19~115^2~23^2~62 X-Git-Url: http://git.monstr.eu/?a=commitdiff_plain;h=cf5b64f7f10b28bebb9b7c9d25e7aee5cbe43918;p=linux-2.6-microblaze.git drm/i915/overlay: Prevent divide by zero bugs in scaling Smatch detected a divide by zero bug in check_overlay_scaling(). drivers/gpu/drm/i915/display/intel_overlay.c:976 check_overlay_scaling() error: potential divide by zero bug '/ rec->dst_height'. drivers/gpu/drm/i915/display/intel_overlay.c:980 check_overlay_scaling() error: potential divide by zero bug '/ rec->dst_width'. Prevent this by ensuring that the dst height and width are non-zero. Fixes: 02e792fbaadb ("drm/i915: implement drmmode overlay support v4") Signed-off-by: Dan Carpenter Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20220124122409.GA31673@kili --- diff --git a/drivers/gpu/drm/i915/display/intel_overlay.c b/drivers/gpu/drm/i915/display/intel_overlay.c index 23f30fdb3519..be0a74b0bb64 100644 --- a/drivers/gpu/drm/i915/display/intel_overlay.c +++ b/drivers/gpu/drm/i915/display/intel_overlay.c @@ -960,6 +960,9 @@ static int check_overlay_dst(struct intel_overlay *overlay, const struct intel_crtc_state *pipe_config = overlay->crtc->config; + if (rec->dst_height == 0 || rec->dst_width == 0) + return -EINVAL; + if (rec->dst_x < pipe_config->pipe_src_w && rec->dst_x + rec->dst_width <= pipe_config->pipe_src_w && rec->dst_y < pipe_config->pipe_src_h &&