From: Tom St Denis <tom.stdenis@amd.com>
Date: Tue, 20 Mar 2018 13:13:08 +0000 (-0400)
Subject: drm/amd/amdgpu: fix offset into page with amdgpu_iomem debugfs file
X-Git-Tag: v4.17-rc1~185^2~4^2~65
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=864917a3b8d459ee2cfd37a1d1c9251cca88d108;p=linux.git

drm/amd/amdgpu: fix offset into page with amdgpu_iomem debugfs file

The offset inside the page wasn't included in the copy call meaning
the start of the page was being read/written instead.

Reported-by: Jay Cornwall <Jay.Cornwall@amd.com>
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 e28b73609fbc..205da3ff9cd0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -2021,7 +2021,7 @@ static ssize_t amdgpu_iomem_read(struct file *f, char __user *buf,
 			return -EPERM;
 
 		ptr = kmap(p);
-		r = copy_to_user(buf, ptr, bytes);
+		r = copy_to_user(buf, ptr + off, bytes);
 		kunmap(p);
 		if (r)
 			return -EFAULT;
@@ -2065,7 +2065,7 @@ static ssize_t amdgpu_iomem_write(struct file *f, const char __user *buf,
 			return -EPERM;
 
 		ptr = kmap(p);
-		r = copy_from_user(ptr, buf, bytes);
+		r = copy_from_user(ptr + off, buf, bytes);
 		kunmap(p);
 		if (r)
 			return -EFAULT;