diff --git a/drivers/gpu/drm/msm/sde_dbg.c b/drivers/gpu/drm/msm/sde_dbg.c
index c886950e5212..93c4c1e27b0d 100644
--- a/drivers/gpu/drm/msm/sde_dbg.c
+++ b/drivers/gpu/drm/msm/sde_dbg.c
@@ -1643,6 +1643,11 @@ static ssize_t sde_evtlog_dump_read(struct file *file, char __user *buff,
 
 	len = sde_evtlog_dump_to_buffer(sde_dbg_base.evtlog, evtlog_buf,
 			SDE_EVTLOG_BUF_MAX, true);
+	if (len < 0 || len > count) {
+		pr_err("len is more than user buffer size");
+		return 0;
+	}
+
 	if (copy_to_user(buff, evtlog_buf, len))
 		return -EFAULT;
 	*ppos += len;