File 0119-drm-amd-amdgpu-Return-error-if-initiating-... of Package drm.7971

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File 0119-drm-amd-amdgpu-Return-error-if-initiating-read-out-o.patch of Package drm.7971

From b85007c9114a05c696c46c2aac6da68aeaed7bbc Mon Sep 17 00:00:00 2001
From: Tom St Denis <tom.stdenis@amd.com>
Date: Tue, 23 May 2017 11:35:22 -0400
Subject: [PATCH] drm/amd/amdgpu: Return error if initiating read out of range on vram
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Git-commit: 9156e723301c0a7a7def4cde820e018ce791b842
Patch-mainline: 4.13-rc1
References: bsc#1041744

commit 9156e723301c0a7a7def4cde820e018ce791b842 upstream.

If you initiate a read that is out of the VRAM address space return
ENXIO instead of 0.

Reads that begin below that point will read upto the VRAM limit as
before.

Signed-off-by: Tom St Denis <tom.stdenis@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1419,6 +1419,9 @@ static ssize_t amdgpu_ttm_vram_read(stru
 	if (size & 0x3 || *pos & 0x3)
 		return -EINVAL;
 
+	if (*pos >= adev->mc.mc_vram_size)
+		return -ENXIO;
+
 	while (size) {
 		unsigned long flags;
 		uint32_t value;

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File 0119-drm-amd-amdgpu-Return-error-if-initiating-read-out-o.patch of Package drm.7971

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