drm/amd/display: Fix possible memleak in dp_trigger_hotplug()

If parse_write_buffer_into_params() fails, we should free
wr_buf before return.

Fixes: 6f77b2ac6280 ("drm/amd/display: Add connector HPD trigger debugfs entry")
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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 9be2f29..47cc39a 100644 (file)
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
@@ -1093,8 +1093,10 @@ static ssize_t dp_trigger_hotplug(struct file *f, const char __user *buf,
        if (parse_write_buffer_into_params(wr_buf, size,
                                                (long *)param, buf,
                                                max_param_num,
-                                               &param_nums))
+                                               &param_nums)) {
+               kfree(wr_buf);
                return -EINVAL;
+       }
 
        if (param_nums <= 0) {
                DRM_DEBUG_DRIVER("user data not be read\n");