1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/dvb/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
index 7ea517b7e186..9be65a3b931f 100644
--- a/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
+++ b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
@@ -1306,6 +1306,10 @@ static ssize_t dvb_ca_en50221_io_write(struct file *file,
         /* fragment the packets & store in the buffer */
         while (fragpos < count) {
                 fraglen = ca->slot_info[slot].link_buf_size - 2;
+                if (fraglen < 0)
+                        break;
+                if (fraglen > HOST_LINK_BUF_SIZE - 2)
+                        fraglen = HOST_LINK_BUF_SIZE - 2;
                 if ((count - fragpos) < fraglen)
                         fraglen = count - fragpos;