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drm: Warn if mode to umode conversion overflows the destination types

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When converting from a drm_display_mode to drm_mode_modeinfo, print a
warning if the the timings values don't fit into the __u16 datatype.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Ville Syrjälä 2012-03-13 12:35:40 +02:00 committed by Dave Airlie
parent 2fcfc75b11
commit e36fae3889
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/drm_crtc.c
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@ -1002,6 +1002,13 @@ EXPORT_SYMBOL(drm_mode_config_cleanup);
void drm_crtc_convert_to_umode(struct drm_mode_modeinfo *out,
struct drm_display_mode *in)
{
WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
"timing values too large for mode info\n");
out->clock = in->clock;
out->hdisplay = in->hdisplay;
out->hsync_start = in->hsync_start;