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| author |   Arnd Bergmann <arnd@arndb.de> | 2018-03-15 17:19:57 +0100 |
|---|---|---|
| committer |   Philipp Zabel <p.zabel@pengutronix.de> | 2018-03-15 17:52:08 +0100 |
| commit | 746d024c3211813946b319411aeb2b47767f8fb0 (patch) | |
| tree | 86f0bc1cc53db5a1e462a26f8c4ae005509d9a10 /drivers/gpu | |
| parent | Linux 4.16-rc5 (diff) | |
| download | linux-dev-746d024c3211813946b319411aeb2b47767f8fb0.tar.xz linux-dev-746d024c3211813946b319411aeb2b47767f8fb0.zip | |
gpu: ipu-v3: prg: avoid possible array underflow
gcc-8 reports that we access an array with a negative index
in an error case:
drivers/gpu/ipu-v3/ipu-prg.c: In function 'ipu_prg_channel_disable':
drivers/gpu/ipu-v3/ipu-prg.c:252:43: error: array subscript -22 is below array bounds of 'struct ipu_prg_channel[3]' [-Werror=array-bounds]
This moves the range check in front of the first time that
variable gets used.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/ipu-v3/ipu-prg.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/drivers/gpu/ipu-v3/ipu-prg.c b/drivers/gpu/ipu-v3/ipu-prg.c index 97b99500153d..83f9dd934a5d 100644 --- a/drivers/gpu/ipu-v3/ipu-prg.c +++ b/drivers/gpu/ipu-v3/ipu-prg.c @@ -250,10 +250,14 @@ void ipu_prg_channel_disable(struct ipuv3_channel *ipu_chan) { int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num); struct ipu_prg *prg = ipu_chan->ipu->prg_priv; - struct ipu_prg_channel *chan = &prg->chan[prg_chan]; + struct ipu_prg_channel *chan; u32 val; - if (!chan->enabled || prg_chan < 0) + if (prg_chan < 0) + return; + + chan = &prg->chan[prg_chan]; + if (!chan->enabled) return; pm_runtime_get_sync(prg->dev); @@ -280,13 +284,15 @@ int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan, { int prg_chan = ipu_prg_ipu_to_prg_chan(ipu_chan->num); struct ipu_prg *prg = ipu_chan->ipu->prg_priv; - struct ipu_prg_channel *chan = &prg->chan[prg_chan]; + struct ipu_prg_channel *chan; u32 val; int ret; if (prg_chan < 0) return prg_chan; + chan = &prg->chan[prg_chan]; + if (chan->enabled) { ipu_pre_update(prg->pres[chan->used_pre], *eba); return 0; |