This is a note to let you know that I've just added the patch titled
iio: accel: mma9551_core: Prevent uninitialized variable in mma9551_read_config_word()
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iio-accel-mma9551_core-prevent-uninitialized-variabl.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit e3e6620e19272f312bf4220b6ee0ef6221a4c0b4
Author: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
Date: Thu Jan 26 07:36:09 2023 -0800
iio: accel: mma9551_core: Prevent uninitialized variable in mma9551_read_config_word()
[ Upstream commit 64a68158738ec8f520347144352f7a09bdb9e169 ]
Smatch Warns:
drivers/iio/accel/mma9551_core.c:299
mma9551_read_config_word() error: uninitialized symbol 'v'.
When (offset >= 1 << 12) is true mma9551_transfer() will return -EINVAL
without 'v' being initialized, so check for the error and return.
Note: No actual bug as caller checks the return value and does not
use the parameter in the problem case.
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapalli@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230126153610.3586243-1-harshit.m.mogalapalli@xxxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/iio/accel/mma9551_core.c b/drivers/iio/accel/mma9551_core.c
index b4bbc83be4310..19b4fbc682e63 100644
--- a/drivers/iio/accel/mma9551_core.c
+++ b/drivers/iio/accel/mma9551_core.c
@@ -304,9 +304,12 @@ int mma9551_read_config_word(struct i2c_client *client, u8 app_id,
ret = mma9551_transfer(client, app_id, MMA9551_CMD_READ_CONFIG,
reg, NULL, 0, (u8 *)&v, 2);
+ if (ret < 0)
+ return ret;
+
*val = be16_to_cpu(v);
- return ret;
+ return 0;
}
EXPORT_SYMBOL(mma9551_read_config_word);
