linux-kernel - [patch] radeon: range check issues

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Message-ID: <20100328112309.GJ5069@bicker>
Date:	Sun, 28 Mar 2010 14:23:09 +0300
From:	Dan Carpenter <error27@...il.com>
To:	Dave Airlie <airlied@...hat.com>
Cc:	Alex Deucher <alexdeucher@...il.com>,
	Jerome Glisse <jglisse@...hat.com>,
	Rafał Miłecki <zajec5@...il.com>,
	dri-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [patch] radeon: 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: Dan Carpenter <error27@...il.com>
---
Compile tested only.  Changing the array size seemed like the right
thing to do, in the context, but please review carefully.

diff --git a/drivers/gpu/drm/radeon/atombios.h b/drivers/gpu/drm/radeon/atombios.h
index 6732b5d..27e2c71 100644
--- a/drivers/gpu/drm/radeon/atombios.h
+++ b/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
diff --git a/drivers/gpu/drm/radeon/radeon_atombios.c b/drivers/gpu/drm/radeon/radeon_atombios.c
index 93783b1..bdc0ab3 100644
--- a/drivers/gpu/drm/radeon/radeon_atombios.c
+++ b/drivers/gpu/drm/radeon/radeon_atombios.c
@@ -1275,7 +1275,7 @@ 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);
@@ -1313,7 +1313,7 @@ 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];

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