From c6243d107c32563d675289ea82b7b3c46fde4918 Mon Sep 17 00:00:00 2001 From: Tom Rix Date: Sat, 22 Aug 2020 23:15:47 +0200 Subject: [PATCH] media: tuner-simple: fix regression in simple_set_radio_freq [ Upstream commit 505bfc2a142f12ce7bc7a878b44abc3496f2e747 ] clang static analysis reports this problem tuner-simple.c:714:13: warning: Assigned value is garbage or undefined buffer[1] = buffer[3]; ^ ~~~~~~~~~ In simple_set_radio_freq buffer[3] used to be done in-function with a switch of tuner type, now done by a call to simple_radio_bandswitch which has this case case TUNER_TENA_9533_DI: case TUNER_YMEC_TVF_5533MF: tuner_dbg("This tuner doesn't ... return 0; which does not set buffer[3]. In the old logic, this case would have returned 0 from simple_set_radio_freq. Recover this old behavior by returning an error for this codition. Since the old simple_set_radio_freq behavior returned a 0, do the same. Fixes: c7a9f3aa1e1b ("V4L/DVB (7129): tuner-simple: move device-specific code into three separate functions") Signed-off-by: Tom Rix Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/tuners/tuner-simple.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/media/tuners/tuner-simple.c b/drivers/media/tuners/tuner-simple.c index b6e70fada3fb..8fb186b25d6a 100644 --- a/drivers/media/tuners/tuner-simple.c +++ b/drivers/media/tuners/tuner-simple.c @@ -500,7 +500,7 @@ static int simple_radio_bandswitch(struct dvb_frontend *fe, u8 *buffer) case TUNER_TENA_9533_DI: case TUNER_YMEC_TVF_5533MF: tuner_dbg("This tuner doesn't have FM. Most cards have a TEA5767 for FM\n"); - return 0; + return -EINVAL; case TUNER_PHILIPS_FM1216ME_MK3: case TUNER_PHILIPS_FM1236_MK3: case TUNER_PHILIPS_FMD1216ME_MK3: @@ -702,7 +702,8 @@ static int simple_set_radio_freq(struct dvb_frontend *fe, TUNER_RATIO_SELECT_50; /* 50 kHz step */ /* Bandswitch byte */ - simple_radio_bandswitch(fe, &buffer[0]); + if (simple_radio_bandswitch(fe, &buffer[0])) + return 0; /* Convert from 1/16 kHz V4L steps to 1/20 MHz (=50 kHz) PLL steps freq * (1 Mhz / 16000 V4L steps) * (20 PLL steps / 1 MHz) =