diff options
| author | Matthias Schwarzott <zzam@gentoo.org> | 2016-07-26 03:53:40 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2016-09-22 12:53:22 -0300 |
| commit | 2df9dda07f56c285564ce97ca76a94e70a50df5e (patch) | |
| tree | cffc4cff865a2217a5edf3ee06239fe3bb2b0f0c /drivers/media/dvb-frontends/si2165.c | |
| parent | c0bf09d047e18e9948a431f7662b20777e540d80 (diff) | |
[media] si2165: avoid division by zero
When si2165_init fails, the clk values in state are still at zero.
But the dvb-core ignores the return value of init will call tune
afterwards.
This will trigger a division by zero when tuning.
At least check for the variables to be non-zero before dividing.
This happened for a system with WinTV HVR-4400 PCIe-card after suspend-to-disk.
Do suspend-to-disk without accessing the DVB device before.
After wakeup try to tune.
si2165_init fails at checking the chip_mode and aborts.
Then si2165_set_if_freq_shift will fail with div-by-zero.
Signed-off-by: Matthias Schwarzott <zzam@gentoo.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/dvb-frontends/si2165.c')
| -rw-r--r-- | drivers/media/dvb-frontends/si2165.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/media/dvb-frontends/si2165.c b/drivers/media/dvb-frontends/si2165.c index 8bf716a8ea58..849c3c421262 100644 --- a/drivers/media/dvb-frontends/si2165.c +++ b/drivers/media/dvb-frontends/si2165.c @@ -751,6 +751,9 @@ static int si2165_set_oversamp(struct si2165_state *state, u32 dvb_rate) u64 oversamp; u32 reg_value; + if (!dvb_rate) + return -EINVAL; + oversamp = si2165_get_fe_clk(state); oversamp <<= 23; do_div(oversamp, dvb_rate); @@ -775,6 +778,9 @@ static int si2165_set_if_freq_shift(struct si2165_state *state) return -EINVAL; } + if (!fe_clk) + return -EINVAL; + fe->ops.tuner_ops.get_if_frequency(fe, &IF); if_freq_shift = IF; if_freq_shift <<= 29; |