From: Shirish S <shirish.s@amd.com>
To: Harry Wentland <harry.wentland@amd.com>,
Leo Li <sunpeng.li@amd.com>,
Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>,
Alex Deucher <alexander.deucher@amd.com>
Cc: amd-gfx@lists.freedesktop.org, Shirish S <shirish.s@amd.com>
Subject: [PATCH] drm/amd/display: fix crash/reboot while accessing sysfs files
Date: Thu, 17 Sep 2020 14:24:18 +0530 [thread overview]
Message-ID: <20200917085418.64517-1-shirish.s@amd.com> (raw)
read/writes to aux_dpcd_* sysfs entries leads to system
reboot or hang.
Hence fix the handling of input data and reporting of errors
appropriately to the user space.
Signed-off-by: Shirish S <shirish.s@amd.com>
---
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
index 004cd8d38214..8cd646eef096 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -908,7 +908,7 @@ static ssize_t dp_dpcd_address_write(struct file *f, const char __user *buf,
struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
if (size < sizeof(connector->debugfs_dpcd_address))
- return 0;
+ return -EINVAL;
r = copy_from_user(&connector->debugfs_dpcd_address,
buf, sizeof(connector->debugfs_dpcd_address));
@@ -923,7 +923,7 @@ static ssize_t dp_dpcd_size_write(struct file *f, const char __user *buf,
struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
if (size < sizeof(connector->debugfs_dpcd_size))
- return 0;
+ return -EINVAL;
r = copy_from_user(&connector->debugfs_dpcd_size,
buf, sizeof(connector->debugfs_dpcd_size));
@@ -943,8 +943,8 @@ static ssize_t dp_dpcd_data_write(struct file *f, const char __user *buf,
struct dc_link *link = connector->dc_link;
uint32_t write_size = connector->debugfs_dpcd_size;
- if (size < write_size)
- return 0;
+ if (!write_size || size < write_size)
+ return -EINVAL;
data = kzalloc(write_size, GFP_KERNEL);
if (!data)
@@ -967,7 +967,7 @@ static ssize_t dp_dpcd_data_read(struct file *f, char __user *buf,
struct dc_link *link = connector->dc_link;
uint32_t read_size = connector->debugfs_dpcd_size;
- if (size < read_size)
+ if (!read_size || size < read_size)
return 0;
data = kzalloc(read_size, GFP_KERNEL);
--
2.17.1
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next reply other threads:[~2020-09-17 8:54 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-17 8:54 Shirish S [this message]
2020-09-18 15:41 ` [PATCH] drm/amd/display: fix crash/reboot while accessing sysfs files Harry Wentland
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