[PATCH 6.0 0223/1073] Input: iqs7222 - report malformed properties

Greg Kroah-Hartman
2022-12-28T15:23:17Z

From: Jeff LaBundy <jeff@labundy.com>

[ Upstream commit 404f3b48e65f058d94429e4a1ec16a1f82ff3b2f ]

Nonzero return values of several calls to fwnode_property_read_u32()
are silently ignored, leaving no way to know the properties were not
applied in the event of an error.

Solve this problem by evaluating fwnode_property_read_u32()'s return
value, and reporting an error for any nonzero return value not equal
to -EINVAL which indicates the property was absent altogether.

Fixes: e505edaedcb9 ("Input: add support for Azoteq IQS7222A/B/C")
Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Link: https://lore.kernel.org/r/Y1SRRrpQXvkETjfm@nixie71
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Stable-dep-of: 2f6fd2329789 ("Input: iqs7222 - protect against undefined slider size")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/input/misc/iqs7222.c | 44 +++++++++++++++++++++++++++++-------
1 file changed, 36 insertions(+), 8 deletions(-)

diff --git a/drivers/input/misc/iqs7222.c b/drivers/input/misc/iqs7222.c
index 3b6e84689879..350be4f23f50 100644
--- a/drivers/input/misc/iqs7222.c
+++ b/drivers/input/misc/iqs7222.c
@@ -1807,8 +1807,9 @@ static int iqs7222_parse_chan(struct iqs7222_private *iqs7222,
chan_setup[0] |= IQS7222_CHAN_SETUP_0_REF_MODE_FOLLOW;
chan_setup[4] = val * 42 + 1048;

- if (!fwnode_property_read_u32(chan_node, "azoteq,ref-weight",
- &val)) {
+ error = fwnode_property_read_u32(chan_node, "azoteq,ref-weight",
+ &val);
+ if (!error) {
if (val > U16_MAX) {
dev_err(&client->dev,
"Invalid %s reference weight: %u\n",
@@ -1817,6 +1818,11 @@ static int iqs7222_parse_chan(struct iqs7222_private *iqs7222,
}

chan_setup[5] = val;
+ } else if (error != -EINVAL) {
+ dev_err(&client->dev,
+ "Failed to read %s reference weight: %d\n",
+ fwnode_get_name(chan_node), error);
+ return error;
}

/*
@@ -1889,9 +1895,10 @@ static int iqs7222_parse_chan(struct iqs7222_private *iqs7222,
if (!event_node)
continue;

- if (!fwnode_property_read_u32(event_node,
- "azoteq,timeout-press-ms",
- &val)) {
+ error = fwnode_property_read_u32(event_node,
+ "azoteq,timeout-press-ms",
+ &val);
+ if (!error) {
/*
* The IQS7222B employs a global pair of press timeout
* registers as opposed to channel-specific registers.
@@ -1911,6 +1918,12 @@ static int iqs7222_parse_chan(struct iqs7222_private *iqs7222,

*setup &= ~(U8_MAX << i * 8);
*setup |= (val / 500 << i * 8);
+ } else if (error != -EINVAL) {
+ dev_err(&client->dev,
+ "Failed to read %s press timeout: %d\n",
+ fwnode_get_name(event_node), error);
+ fwnode_handle_put(event_node);
+ return error;
}

error = iqs7222_parse_event(iqs7222, event_node, chan_index,
@@ -2009,7 +2022,8 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222,
if (fwnode_property_present(sldr_node, "azoteq,use-prox"))
sldr_setup[4 + reg_offset] -= 2;

- if (!fwnode_property_read_u32(sldr_node, "azoteq,slider-size", &val)) {
+ error = fwnode_property_read_u32(sldr_node, "azoteq,slider-size", &val);
+ if (!error) {
if (!val || val > dev_desc->sldr_res) {
dev_err(&client->dev, "Invalid %s size: %u\n",
fwnode_get_name(sldr_node), val);
@@ -2023,9 +2037,14 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222,
sldr_setup[2] |= (val / 16 <<
IQS7222_SLDR_SETUP_2_RES_SHIFT);
}
+ } else if (error != -EINVAL) {
+ dev_err(&client->dev, "Failed to read %s size: %d\n",
+ fwnode_get_name(sldr_node), error);
+ return error;
}

- if (!fwnode_property_read_u32(sldr_node, "azoteq,top-speed", &val)) {
+ error = fwnode_property_read_u32(sldr_node, "azoteq,top-speed", &val);
+ if (!error) {
if (val > (reg_offset ? U16_MAX : U8_MAX * 4)) {
dev_err(&client->dev, "Invalid %s top speed: %u\n",
fwnode_get_name(sldr_node), val);
@@ -2038,9 +2057,14 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222,
sldr_setup[2] &= ~IQS7222_SLDR_SETUP_2_TOP_SPEED_MASK;
sldr_setup[2] |= (val / 4);
}
+ } else if (error != -EINVAL) {
+ dev_err(&client->dev, "Failed to read %s top speed: %d\n",
+ fwnode_get_name(sldr_node), error);
+ return error;
}

- if (!fwnode_property_read_u32(sldr_node, "linux,axis", &val)) {
+ error = fwnode_property_read_u32(sldr_node, "linux,axis", &val);
+ if (!error) {
u16 sldr_max = sldr_setup[3] - 1;

if (!reg_offset) {
@@ -2054,6 +2078,10 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222,

input_set_abs_params(iqs7222->keypad, val, 0, sldr_max, 0, 0);
iqs7222->sl_axis[sldr_index] = val;
+ } else if (error != -EINVAL) {
+ dev_err(&client->dev, "Failed to read %s axis: %d\n",
+ fwnode_get_name(sldr_node), error);
+ return error;
}

if (dev_desc->wheel_enable) {
--
2.35.1