From a7e8439e297ef3b08b1a9455b8c355b7fa446987 Mon Sep 17 00:00:00 2001 From: Jeff LaBundy Date: Sat, 22 Oct 2022 19:57:00 -0500 Subject: [PATCH] Input: iqs7222 - protect against undefined slider size [ Upstream commit 2f6fd232978906f6fb054529210b9faec384bd45 ] Select variants of silicon do not define a default slider size, in which case the size must be specified in the device tree. If it is not, the axis's maximum value is reported as 65535 due to unsigned integer overflow. To solve this problem, move the existing zero-check outside of the conditional block that checks whether the property is present. Fixes: e505edaedcb9 ("Input: add support for Azoteq IQS7222A/B/C") Signed-off-by: Jeff LaBundy Link: https://lore.kernel.org/r/Y1SRXEi7XMlncDWk@nixie71 Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin --- drivers/input/misc/iqs7222.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/input/misc/iqs7222.c b/drivers/input/misc/iqs7222.c index ddb863b..3251594 100644 --- a/drivers/input/misc/iqs7222.c +++ b/drivers/input/misc/iqs7222.c @@ -2066,7 +2066,7 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222, int sldr_index) sldr_setup[4 + reg_offset] -= 2; if (!fwnode_property_read_u32(sldr_node, "azoteq,slider-size", &val)) { - if (!val || val > dev_desc->sldr_res) { + if (val > dev_desc->sldr_res) { dev_err(&client->dev, "Invalid %s size: %u\n", fwnode_get_name(sldr_node), val); return -EINVAL; @@ -2081,6 +2081,13 @@ static int iqs7222_parse_sldr(struct iqs7222_private *iqs7222, int sldr_index) } } + if (!(reg_offset ? sldr_setup[3] + : sldr_setup[2] & IQS7222_SLDR_SETUP_2_RES_MASK)) { + dev_err(&client->dev, "Undefined %s size\n", + fwnode_get_name(sldr_node)); + return -EINVAL; + } + if (!fwnode_property_read_u32(sldr_node, "azoteq,top-speed", &val)) { if (val > (reg_offset ? U16_MAX : U8_MAX * 4)) { dev_err(&client->dev, "Invalid %s top speed: %u\n", -- 2.7.4