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@xxxxxxx> --- .../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 _______________________________________________ amd-gfx mailing list amd-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/amd-gfx
