From: Andrew Duggan <aduggan@xxxxxxxxxxxxx> 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@xxxxxxxxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Link: https://lore.kernel.org/r/20191025002527.3189-3-aduggan@xxxxxxxxxxxxx Signed-off-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- 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 @@ -1284,8 +1284,8 @@ static irqreturn_t rmi_f11_attention(int 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 @@ -212,8 +212,8 @@ static irqreturn_t rmi_f12_attention(int 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);
