a8d6aa08dd
If bytes == (TPS6507X_MAX_REGISTER + 1), we have a buffer overflow when doing memcpy(&msg[1], src, bytes). Signed-off-by: Axel Lin <axel.lin@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
157 lines
3.2 KiB
C
157 lines
3.2 KiB
C
/*
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* tps6507x.c -- TPS6507x chip family multi-function driver
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*
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* Copyright (c) 2010 RidgeRun (todd.fischer@ridgerun.com)
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*
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* Author: Todd Fischer
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* todd.fischer@ridgerun.com
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*
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* Credits:
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*
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* Using code from wm831x-*.c, wm8400-core, Wolfson Microelectronics PLC.
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*
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* For licencing details see kernel-base/COPYING
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*
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tps6507x.h>
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static struct mfd_cell tps6507x_devs[] = {
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{
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.name = "tps6507x-pmic",
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},
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{
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.name = "tps6507x-ts",
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},
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};
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static int tps6507x_i2c_read_device(struct tps6507x_dev *tps6507x, char reg,
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int bytes, void *dest)
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{
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struct i2c_client *i2c = tps6507x->i2c_client;
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struct i2c_msg xfer[2];
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int ret;
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/* Write register */
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xfer[0].addr = i2c->addr;
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xfer[0].flags = 0;
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xfer[0].len = 1;
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xfer[0].buf = ®
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/* Read data */
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xfer[1].addr = i2c->addr;
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xfer[1].flags = I2C_M_RD;
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xfer[1].len = bytes;
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xfer[1].buf = dest;
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ret = i2c_transfer(i2c->adapter, xfer, 2);
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if (ret == 2)
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ret = 0;
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else if (ret >= 0)
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ret = -EIO;
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return ret;
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}
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static int tps6507x_i2c_write_device(struct tps6507x_dev *tps6507x, char reg,
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int bytes, void *src)
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{
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struct i2c_client *i2c = tps6507x->i2c_client;
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/* we add 1 byte for device register */
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u8 msg[TPS6507X_MAX_REGISTER + 1];
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int ret;
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if (bytes > TPS6507X_MAX_REGISTER)
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return -EINVAL;
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msg[0] = reg;
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memcpy(&msg[1], src, bytes);
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ret = i2c_master_send(i2c, msg, bytes + 1);
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if (ret < 0)
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return ret;
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if (ret != bytes + 1)
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return -EIO;
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return 0;
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}
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static int tps6507x_i2c_probe(struct i2c_client *i2c,
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const struct i2c_device_id *id)
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{
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struct tps6507x_dev *tps6507x;
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int ret = 0;
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tps6507x = kzalloc(sizeof(struct tps6507x_dev), GFP_KERNEL);
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if (tps6507x == NULL)
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return -ENOMEM;
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i2c_set_clientdata(i2c, tps6507x);
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tps6507x->dev = &i2c->dev;
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tps6507x->i2c_client = i2c;
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tps6507x->read_dev = tps6507x_i2c_read_device;
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tps6507x->write_dev = tps6507x_i2c_write_device;
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ret = mfd_add_devices(tps6507x->dev, -1,
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tps6507x_devs, ARRAY_SIZE(tps6507x_devs),
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NULL, 0);
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if (ret < 0)
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goto err;
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return ret;
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err:
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mfd_remove_devices(tps6507x->dev);
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kfree(tps6507x);
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return ret;
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}
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static int tps6507x_i2c_remove(struct i2c_client *i2c)
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{
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struct tps6507x_dev *tps6507x = i2c_get_clientdata(i2c);
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mfd_remove_devices(tps6507x->dev);
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kfree(tps6507x);
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return 0;
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}
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static const struct i2c_device_id tps6507x_i2c_id[] = {
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{ "tps6507x", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, tps6507x_i2c_id);
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static struct i2c_driver tps6507x_i2c_driver = {
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.driver = {
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.name = "tps6507x",
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.owner = THIS_MODULE,
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},
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.probe = tps6507x_i2c_probe,
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.remove = tps6507x_i2c_remove,
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.id_table = tps6507x_i2c_id,
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};
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static int __init tps6507x_i2c_init(void)
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{
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return i2c_add_driver(&tps6507x_i2c_driver);
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}
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/* init early so consumer devices can complete system boot */
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subsys_initcall(tps6507x_i2c_init);
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static void __exit tps6507x_i2c_exit(void)
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{
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i2c_del_driver(&tps6507x_i2c_driver);
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}
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module_exit(tps6507x_i2c_exit);
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MODULE_DESCRIPTION("TPS6507x chip family multi-function driver");
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MODULE_LICENSE("GPL");
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