From: Tom St Denis <tom.stdenis@amd.com>
Date: Tue, 23 May 2017 15:35:22 +0000 (-0400)
Subject: drm/amd/amdgpu: Return error if initiating read out of range on vram
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=9156e723301c0a7a7def4cde820e018ce791b842;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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

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.

Cc: stable@vger.kernel.org
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>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index fcf617c237ef..8526a0222268 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1468,6 +1468,9 @@ static ssize_t amdgpu_ttm_vram_read(struct file *f, char __user *buf,
 	if (size & 0x3 || *pos & 0x3)
 		return -EINVAL;
 
+	if (*pos >= adev->mc.mc_vram_size)
+		return -ENXIO;
+
 	while (size) {
 		unsigned long flags;
 		uint32_t value;