Patch "drm/amd/amdgpu: Return error if initiating read out of range on vram" has been added to the 4.9-stable tree

Patch "drm/amd/amdgpu: Return error if initiating read out of range on vram" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/amd/amdgpu: Return error if initiating read out of range on vram

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-amd-amdgpu-return-error-if-initiating-read-out-of-range-on-vram.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 9156e723301c0a7a7def4cde820e018ce791b842 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: drm/amd/amdgpu: Return error if initiating read out of range on vram
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Tom St Denis <tom.stdenis@amd.com>

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>

---
 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;


Patches currently in stable-queue which might be from tom.stdenis@amd.com are

queue-4.9/drm-amd-amdgpu-return-error-if-initiating-read-out-of-range-on-vram.patch