drivers/gpu/drm/radeon/radeon_atombios.c: range check issues

This change makes the array larger, "MAX_SUPPORTED_TV_TIMING_V1_2" is 3
and the original size "MAX_SUPPORTED_TV_TIMING" is 2.

Also there were checks that were off by one.
Signed-off-by: NDan Carpenter <error27@gmail.com>
Acked-by: NAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NDave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/atombios.h

@@ -2912,7 +2912,7 @@ typedef struct _ATOM_ANALOG_TV_INFO_V1_2
   UCHAR                    ucTV_BootUpDefaultStandard; 
   UCHAR                    ucExt_TV_ASIC_ID;
   UCHAR                    ucExt_TV_ASIC_SlaveAddr;
-  ATOM_DTD_FORMAT          aModeTimings[MAX_SUPPORTED_TV_TIMING];
+  ATOM_DTD_FORMAT          aModeTimings[MAX_SUPPORTED_TV_TIMING_V1_2];
 }ATOM_ANALOG_TV_INFO_V1_2;
 
 typedef struct _ATOM_DPCD_INFO

drivers/gpu/drm/radeon/radeon_atombios.c

@@ -1264,7 +1264,7 @@ bool radeon_atom_get_tv_timings(struct radeon_device *rdev, int index,
 	switch (crev) {
 	case 1:
 		tv_info = (ATOM_ANALOG_TV_INFO *)(mode_info->atom_context->bios + data_offset);
-		if (index > MAX_SUPPORTED_TV_TIMING)
+		if (index >= MAX_SUPPORTED_TV_TIMING)
 			return false;
 
 		mode->crtc_htotal = le16_to_cpu(tv_info->aModeTimings[index].usCRTC_H_Total);
@@ -1302,7 +1302,7 @@ bool radeon_atom_get_tv_timings(struct radeon_device *rdev, int index,
 		break;
 	case 2:
 		tv_info_v1_2 = (ATOM_ANALOG_TV_INFO_V1_2 *)(mode_info->atom_context->bios + data_offset);
-		if (index > MAX_SUPPORTED_TV_TIMING_V1_2)
+		if (index >= MAX_SUPPORTED_TV_TIMING_V1_2)
 			return false;
 
 		dtd_timings = &tv_info_v1_2->aModeTimings[index];