[PATCH -next] drm/amd/display: Fix possible memleak in dp_trigger_hotplug()

[YueHaibing]

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")
Signed-off-by: YueHaibing <yuehaib...@huawei.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

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 83da24aced45..11e16fbe484d 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
@@ -1089,8 +1089,10 @@ static ssize_t dp_trigger_hotplug(struct file *f, const 
char __user *buf,
        if (parse_write_buffer_into_params(wr_buf, 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");
-- 
2.17.1