diff options
| author | Wei Yongjun <weiyongjun1@huawei.com> | 2022-11-07 18:19:46 +0300 |
|---|---|---|
| committer | Jonathan Cameron <Jonathan.Cameron@huawei.com> | 2022-11-12 19:29:57 +0300 |
| commit | 58143c1ed5882c138a3cd2251a336fc8755f23d9 (patch) | |
| tree | a67ad83fc11cb8b3efbb7caf0f7803571015b668 /drivers/iio | |
| parent | 0aa60ff5d996d4ecdd4a62699c01f6d00f798d59 (diff) | |
| download | linux-58143c1ed5882c138a3cd2251a336fc8755f23d9.tar.xz | |
iio: health: afe4403: Fix oob read in afe4403_read_raw
KASAN report out-of-bounds read as follows:
BUG: KASAN: global-out-of-bounds in afe4403_read_raw+0x42e/0x4c0
Read of size 4 at addr ffffffffc02ac638 by task cat/279
Call Trace:
afe4403_read_raw
iio_read_channel_info
dev_attr_show
The buggy address belongs to the variable:
afe4403_channel_leds+0x18/0xffffffffffffe9e0
This issue can be reproduced by singe command:
$ cat /sys/bus/spi/devices/spi0.0/iio\:device0/in_intensity6_raw
The array size of afe4403_channel_leds is less than channels, so access
with chan->address cause OOB read in afe4403_read_raw. Fix it by moving
access before use it.
Fixes: b36e8257641a ("iio: health/afe440x: Use regmap fields")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Acked-by: Andrew Davis <afd@ti.com>
Link: https://lore.kernel.org/r/20221107151946.89260-1-weiyongjun@huaweicloud.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/health/afe4403.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/iio/health/afe4403.c b/drivers/iio/health/afe4403.c index 3bb4028c5d74..df3bc5c3d378 100644 --- a/drivers/iio/health/afe4403.c +++ b/drivers/iio/health/afe4403.c @@ -245,14 +245,14 @@ static int afe4403_read_raw(struct iio_dev *indio_dev, int *val, int *val2, long mask) { struct afe4403_data *afe = iio_priv(indio_dev); - unsigned int reg = afe4403_channel_values[chan->address]; - unsigned int field = afe4403_channel_leds[chan->address]; + unsigned int reg, field; int ret; switch (chan->type) { case IIO_INTENSITY: switch (mask) { case IIO_CHAN_INFO_RAW: + reg = afe4403_channel_values[chan->address]; ret = afe4403_read(afe, reg, val); if (ret) return ret; @@ -262,6 +262,7 @@ static int afe4403_read_raw(struct iio_dev *indio_dev, case IIO_CURRENT: switch (mask) { case IIO_CHAN_INFO_RAW: + field = afe4403_channel_leds[chan->address]; ret = regmap_field_read(afe->fields[field], val); if (ret) return ret; |