[PATCH] input: atmel_mxt_ts: fix double free

[trix]

From: Tom Rix <t...@redhat.com>

Clang static analysis reports this error

atmel_mxt_ts.c:1850:2: warning: Attempt to free released memory
        kfree(id_buf);
        ^~~~~~~~~~~~~

The problem is with this code block

data->raw_info_block = id_buf;
...
error = mxt_parse_object_table(data, id_buf + MXT_OBJECT_START);
if (error) {
        dev_err(&client->dev, "Error %d parsing object table\n", error);
        mxt_free_object_table(data);
        goto err_free_mem;
}

mxt_free_object_table() frees id_buf

kfree(data->raw_info_block);

So skip over the second free

Fixes: 068bdb67ef74 ("Input: atmel_mxt_ts - fix the firmware update")

Signed-off-by: Tom Rix <t...@redhat.com>
---
 drivers/input/touchscreen/atmel_mxt_ts.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c 
b/drivers/input/touchscreen/atmel_mxt_ts.c
index 6b71b0aff115..1cc0f492f4f4 100644
--- a/drivers/input/touchscreen/atmel_mxt_ts.c
+++ b/drivers/input/touchscreen/atmel_mxt_ts.c
@@ -1839,7 +1839,7 @@ static int mxt_read_info_block(struct mxt_data *data)
        if (error) {
                dev_err(&client->dev, "Error %d parsing object table\n", error);
                mxt_free_object_table(data);
-               goto err_free_mem;
+               goto err_free_mem1;
        }
 
        data->object_table = (struct mxt_object *)(id_buf + MXT_OBJECT_START);
@@ -1848,6 +1848,7 @@ static int mxt_read_info_block(struct mxt_data *data)
 
 err_free_mem:
        kfree(id_buf);
+err_free_mem1:
        return error;
 }
 
-- 
2.18.1