media: tda10071: fix unsigned sign extension overflow

[ Upstream commit a7463e2dc698075132de9905b89f495df888bb79 ]

The shifting of buf[3] by 24 bits to the left will be promoted to
a 32 bit signed int and then sign-extended to an unsigned long. In
the unlikely event that the the top bit of buf[3] is set then all
then all the upper bits end up as also being set because of
the sign-extension and this affect the ev->post_bit_error sum.
Fix this by using the temporary u32 variable bit_error to avoid
the sign-extension promotion. This also removes the need to do the
computation twice.

Addresses-Coverity: ("Unintended sign extension")

Fixes: 267897a4708f ("[media] tda10071: implement DVBv5 statistics")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/media/dvb-frontends/tda10071.c b/drivers/media/dvb-frontends/tda10071.c
index a59f4fd09df605d3568fea54706da363a6ea92bf..27466b0d0be86367a3c9ba0e0d007f42be12d832 100644 (file)
--- a/drivers/media/dvb-frontends/tda10071.c
+++ b/drivers/media/dvb-frontends/tda10071.c
@@ -483,10 +483,11 @@ static int tda10071_read_status(struct dvb_frontend *fe, enum fe_status *status)
                        goto error;
 
                if (dev->delivery_system == SYS_DVBS) {
-                       dev->dvbv3_ber = buf[0] << 24 | buf[1] << 16 |
-                                        buf[2] << 8 | buf[3] << 0;
-                       dev->post_bit_error += buf[0] << 24 | buf[1] << 16 |
-                                              buf[2] << 8 | buf[3] << 0;
+                       u32 bit_error = buf[0] << 24 | buf[1] << 16 |
+                                       buf[2] << 8 | buf[3] << 0;
+
+                       dev->dvbv3_ber = bit_error;
+                       dev->post_bit_error += bit_error;
                        c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
                        c->post_bit_error.stat[0].uvalue = dev->post_bit_error;
                        dev->block_error += buf[4] << 8 | buf[5] << 0;