4.14-stable review patch. If anyone has any objections, please let me know.
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[ Upstream commit 70df9ebbd82c794ddfbb49d45b337f18d5588dc2 ]
When using DT configurations, the id pointer might turn out to be NULL. Then the driver encounters NULL pointer access:
Unable to handle kernel read from unreadable memory at vaddr 00000018 [...] PC is at ina2xx_probe+0x114/0x200 LR is at ina2xx_probe+0x10c/0x200 [...] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
The reason is that i2c core returns the id pointer by matching id_table with client->name, while the client->name is actually using the name from the first string in the DT compatible list, not the best one. So i2c core would fail to match the id_table if the best matched compatible string isn't the first one, and then would return a NULL id pointer.
This probably should be fixed in i2c core. But it doesn't hurt to make the driver robust. So this patch fixes it by using the "chip" that's added to unify both DT and non-DT configurations.
Additionally, since id pointer could be null, so as id->name: ina2xx 10-0047: power monitor (null) (Rshunt = 1000 uOhm) ina2xx 10-0048: power monitor (null) (Rshunt = 10000 uOhm)
So this patch also fixes NULL name pointer, using client->name to play safe and to align with hwmon->name.
Fixes: bd0ddd4d0883 ("hwmon: (ina2xx) Add OF device ID table") Signed-off-by: Nicolin Chen nicoleotsuka@gmail.com Signed-off-by: Guenter Roeck linux@roeck-us.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/hwmon/ina2xx.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/hwmon/ina2xx.c b/drivers/hwmon/ina2xx.c index 71d3445ba869..c2252cf452f5 100644 --- a/drivers/hwmon/ina2xx.c +++ b/drivers/hwmon/ina2xx.c @@ -491,7 +491,7 @@ static int ina2xx_probe(struct i2c_client *client, }
data->groups[group++] = &ina2xx_group; - if (id->driver_data == ina226) + if (chip == ina226) data->groups[group++] = &ina226_group;
hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, @@ -500,7 +500,7 @@ static int ina2xx_probe(struct i2c_client *client, return PTR_ERR(hwmon_dev);
dev_info(dev, "power monitor %s (Rshunt = %li uOhm)\n", - id->name, data->rshunt); + client->name, data->rshunt);
return 0; }