From: Andrew Duggan aduggan@synaptics.com
commit 5d40d95e7e64756cc30606c2ba169271704d47cb upstream.
Currently, rmi_f11_attention() and rmi_f12_attention() functions update the attn_data data pointer and size based on the size of the expected size of the attention data. However, if the actual valid data in the attn buffer is less then the expected value then the updated data pointer will point to memory beyond the end of the attn buffer. Using the calculated valid_bytes instead will prevent this from happening.
Signed-off-by: Andrew Duggan aduggan@synaptics.com Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20191025002527.3189-3-aduggan@synaptics.com Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/input/rmi4/rmi_f11.c | 4 ++-- drivers/input/rmi4/rmi_f12.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/input/rmi4/rmi_f11.c +++ b/drivers/input/rmi4/rmi_f11.c @@ -1295,8 +1295,8 @@ static int rmi_f11_attention(struct rmi_ valid_bytes = f11->sensor.attn_size; memcpy(f11->sensor.data_pkt, drvdata->attn_data.data, valid_bytes); - drvdata->attn_data.data += f11->sensor.attn_size; - drvdata->attn_data.size -= f11->sensor.attn_size; + drvdata->attn_data.data += valid_bytes; + drvdata->attn_data.size -= valid_bytes; } else { error = rmi_read_block(rmi_dev, data_base_addr, f11->sensor.data_pkt, --- a/drivers/input/rmi4/rmi_f12.c +++ b/drivers/input/rmi4/rmi_f12.c @@ -217,8 +217,8 @@ static int rmi_f12_attention(struct rmi_ valid_bytes = sensor->attn_size; memcpy(sensor->data_pkt, drvdata->attn_data.data, valid_bytes); - drvdata->attn_data.data += sensor->attn_size; - drvdata->attn_data.size -= sensor->attn_size; + drvdata->attn_data.data += valid_bytes; + drvdata->attn_data.size -= valid_bytes; } else { retval = rmi_read_block(rmi_dev, f12->data_addr, sensor->data_pkt, sensor->pkt_size);