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| author |   Kangjie Lu <kjlu@umn.edu> | 2018-12-20 02:48:42 -0500 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab+samsung@kernel.org> | 2019-01-16 11:43:48 -0500 |
| commit | c9b7d8f252a5a6f8ca6e948151367cbc7bc4b776 (patch) | |
| tree | 1e833b698a630062e814a65d89889387a6e85539 /drivers/media/dvb-frontends | |
| parent | media: seco-cec: fix RC_CORE dependency (diff) | |
| download | wireguard-linux-c9b7d8f252a5a6f8ca6e948151367cbc7bc4b776.tar.xz wireguard-linux-c9b7d8f252a5a6f8ca6e948151367cbc7bc4b776.zip | |
media: lgdt3306a: fix a missing check of return value
If lgdt3306a_read_reg() fails, the read data in "val" is incorrect, thus
shouldn't be further used. The fix inserts a check for the return value
of lgdt3306a_read_reg(). If it fails, goto fail.
Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Diffstat (limited to 'drivers/media/dvb-frontends')
| -rw-r--r-- | drivers/media/dvb-frontends/lgdt3306a.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/media/dvb-frontends/lgdt3306a.c b/drivers/media/dvb-frontends/lgdt3306a.c index cee9c83e48de..99c6289ae585 100644 --- a/drivers/media/dvb-frontends/lgdt3306a.c +++ b/drivers/media/dvb-frontends/lgdt3306a.c @@ -1685,7 +1685,10 @@ static int lgdt3306a_read_signal_strength(struct dvb_frontend *fe, case QAM_256: case QAM_AUTO: /* need to know actual modulation to set proper SNR baseline */ - lgdt3306a_read_reg(state, 0x00a6, &val); + ret = lgdt3306a_read_reg(state, 0x00a6, &val); + if (lg_chkerr(ret)) + goto fail; + if(val & 0x04) ref_snr = 2800; /* QAM-256 28dB */ else |