This is a note to let you know that I've just added the patch titled

iio: sx9310: Fix access to variable DT array

to my staging git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging.git in the staging-testing branch.

The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)

The patch will be merged to the staging-next branch sometime soon, after it passes testing, and the merge window is open.

If you have any questions about this process, please let me know.

From 6f0078ae704d94b1a93e5f3d0a44cf3d8090fa91 Mon Sep 17 00:00:00 2001

From: Gwendal Grignou gwendal@chromium.org Date: Fri, 26 Mar 2021 11:46:02 -0700 Subject: iio: sx9310: Fix access to variable DT array

With the current code, we want to read 4 entries from DT array "semtech,combined-sensors". If there are less, we silently fail as of_property_read_u32_array() returns -EOVERFLOW.

First count the number of entries and if between 1 and 4, collect the content of the array.

Fixes: 5b19ca2c78a0 ("iio: sx9310: Set various settings from DT") Signed-off-by: Gwendal Grignou gwendal@chromium.org Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Link: https://lore.kernel.org/r/20210326184603.251683-2-gwendal@chromium.org Cc: stable@vger.kernel.org Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com --- drivers/iio/proximity/sx9310.c | 40 ++++++++++++++++++++++++---------- 1 file changed, 28 insertions(+), 12 deletions(-)

diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c index 394c2afe0f23..289c76bb3b02 100644 --- a/drivers/iio/proximity/sx9310.c +++ b/drivers/iio/proximity/sx9310.c @@ -1213,17 +1213,17 @@ static int sx9310_init_compensation(struct iio_dev *indio_dev) }

static const struct sx9310_reg_default * -sx9310_get_default_reg(struct sx9310_data *data, int i, +sx9310_get_default_reg(struct sx9310_data *data, int idx, struct sx9310_reg_default *reg_def) { - int ret; const struct device_node *np = data->client->dev.of_node; - u32 combined[SX9310_NUM_CHANNELS] = { 4, 4, 4, 4 }; + u32 combined[SX9310_NUM_CHANNELS]; + u32 start = 0, raw = 0, pos = 0; unsigned long comb_mask = 0; + int ret, i, count; const char *res; - u32 start = 0, raw = 0, pos = 0;

- memcpy(reg_def, &sx9310_default_regs[i], sizeof(*reg_def)); + memcpy(reg_def, &sx9310_default_regs[idx], sizeof(*reg_def)); if (!np) return reg_def;

@@ -1234,15 +1234,31 @@ sx9310_get_default_reg(struct sx9310_data *data, int i, reg_def->def |= SX9310_REG_PROX_CTRL2_SHIELDEN_GROUND; }

- reg_def->def &= ~SX9310_REG_PROX_CTRL2_COMBMODE_MASK; - of_property_read_u32_array(np, "semtech,combined-sensors", - combined, ARRAY_SIZE(combined)); - for (i = 0; i < ARRAY_SIZE(combined); i++) { - if (combined[i] <= SX9310_NUM_CHANNELS) - comb_mask |= BIT(combined[i]); + count = of_property_count_elems_of_size(np, "semtech,combined-sensors", + sizeof(u32)); + if (count > 0 && count <= ARRAY_SIZE(combined)) { + ret = of_property_read_u32_array(np, "semtech,combined-sensors", + combined, count); + if (ret) + break; + } else { + /* + * Either the property does not exist in the DT or the + * number of entries is incorrect. + */ + break; + } + for (i = 0; i < count; i++) { + if (combined[i] >= SX9310_NUM_CHANNELS) { + /* Invalid sensor (invalid DT). */ + break; + } + comb_mask |= BIT(combined[i]); } + if (i < count) + break;

- comb_mask &= 0xf; + reg_def->def &= ~SX9310_REG_PROX_CTRL2_COMBMODE_MASK; if (comb_mask == (BIT(3) | BIT(2) | BIT(1) | BIT(0))) reg_def->def |= SX9310_REG_PROX_CTRL2_COMBMODE_CS0_CS1_CS2_CS3; else if (comb_mask == (BIT(1) | BIT(2)))