Input: cyttsp - fix memcpy size param

commit d2983cdb480157f637df07723f28aaa657b1080d upstream.

memcpy param is wrong because of offset in bl_cmd, this may corrupt the
stack which may cause a crash.

Tested-by: Ferruh Yigit <fery@cypress.com> on TMA300-DVK
Signed-off-by: Ferruh Yigit <fery@cypress.com>
Acked-by: Javier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/input/touchscreen/cyttsp_core.c b/drivers/input/touchscreen/cyttsp_core.c
index 8e60437ac85b46569e57ae78f2bea455fd1b9ab5..97ba8912831256ec38a52be591ae30b38d20e8ab 100644 (file)
--- a/drivers/input/touchscreen/cyttsp_core.c
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -133,7 +133,7 @@ static int cyttsp_exit_bl_mode(struct cyttsp *ts)
        memcpy(bl_cmd, bl_command, sizeof(bl_command));
        if (ts->pdata->bl_keys)
                memcpy(&bl_cmd[sizeof(bl_command) - CY_NUM_BL_KEYS],
-                       ts->pdata->bl_keys, sizeof(bl_command));
+                       ts->pdata->bl_keys, CY_NUM_BL_KEYS);
 
        error = ttsp_write_block_data(ts, CY_REG_BASE,
                                      sizeof(bl_cmd), bl_cmd);