[PATCH 5.10 297/530] media: m88rs6000t: avoid potential out-of-bounds reads on arrays
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-05-12 16:12:51
Also in:
lkml
Subsystem:
media input infrastructure (v4l/dvb), the rest · Maintainers:
Mauro Carvalho Chehab, Linus Torvalds
From: Colin Ian King <redacted>
[ Upstream commit 9baa3d64e8e2373ddd11c346439e5dfccb2cbb0d ]
There a 3 array for-loops that don't check the upper bounds of the
index into arrays and this may lead to potential out-of-bounds
reads. Fix this by adding array size upper bounds checks to be
full safe.
Addresses-Coverity: ("Out-of-bounds read")
Link: https://lore.kernel.org/linux-media/20201007121628.20676-1-colin.king@canonical.com (local)
Fixes: 333829110f1d ("[media] m88rs6000t: add new dvb-s/s2 tuner for integrated chip M88RS6000")
Signed-off-by: Colin Ian King <redacted>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/tuners/m88rs6000t.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/media/tuners/m88rs6000t.c b/drivers/media/tuners/m88rs6000t.c
index b3505f402476..8647c50b66e5 100644
--- a/drivers/media/tuners/m88rs6000t.c
+++ b/drivers/media/tuners/m88rs6000t.c@@ -525,7 +525,7 @@ static int m88rs6000t_get_rf_strength(struct dvb_frontend *fe, u16 *strength) PGA2_cri = PGA2_GC >> 2; PGA2_crf = PGA2_GC & 0x03; - for (i = 0; i <= RF_GC; i++) + for (i = 0; i <= RF_GC && i < ARRAY_SIZE(RFGS); i++) RFG += RFGS[i]; if (RF_GC == 0)
@@ -537,12 +537,12 @@ static int m88rs6000t_get_rf_strength(struct dvb_frontend *fe, u16 *strength) if (RF_GC == 3) RFG += 100; - for (i = 0; i <= IF_GC; i++) + for (i = 0; i <= IF_GC && i < ARRAY_SIZE(IFGS); i++) IFG += IFGS[i]; TIAG = TIA_GC * TIA_GS; - for (i = 0; i <= BB_GC; i++) + for (i = 0; i <= BB_GC && i < ARRAY_SIZE(BBGS); i++) BBG += BBGS[i]; PGA2G = PGA2_cri * PGA2_cri_GS + PGA2_crf * PGA2_crf_GS;
--
2.30.2