6.12-stable review patch. If anyone has any objections, please let me know.
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From: Karan Sanghavi karansanghvi98@gmail.com
[ Upstream commit ee735aa33db16c1fb5ebccbaf84ad38f5583f3cc ]
The array contains only 5 elements, but the index calculated by veml6075_read_int_time_index can range from 0 to 7, which could lead to out-of-bounds access. The check prevents this issue.
Coverity Issue CID 1574309: (#1 of 1): Out-of-bounds read (OVERRUN) overrun-local: Overrunning array veml6075_it_ms of 5 4-byte elements at element index 7 (byte offset 31) using index int_index (which evaluates to 7)
This is hardening against potentially broken hardware. Good to have but not necessary to backport.
Fixes: 3b82f43238ae ("iio: light: add VEML6075 UVA and UVB light sensor driver") Signed-off-by: Karan Sanghavi karansanghvi98@gmail.com Reviewed-by: Javier Carrasco javier.carrasco.cruz@gmail.com Link: https://patch.msgid.link/Z7dnrEpKQdRZ2qFU@Emma Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iio/light/veml6075.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/light/veml6075.c b/drivers/iio/light/veml6075.c index 05d4c0e9015d6..859891e8f1152 100644 --- a/drivers/iio/light/veml6075.c +++ b/drivers/iio/light/veml6075.c @@ -195,13 +195,17 @@ static int veml6075_read_uv_direct(struct veml6075_data *data, int chan,
static int veml6075_read_int_time_index(struct veml6075_data *data) { - int ret, conf; + int ret, conf, int_index;
ret = regmap_read(data->regmap, VEML6075_CMD_CONF, &conf); if (ret < 0) return ret;
- return FIELD_GET(VEML6075_CONF_IT, conf); + int_index = FIELD_GET(VEML6075_CONF_IT, conf); + if (int_index >= ARRAY_SIZE(veml6075_it_ms)) + return -EINVAL; + + return int_index; }
static int veml6075_read_int_time_ms(struct veml6075_data *data, int *val)