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i2c: dev: Force case user pointers in compat_i2cdev_ioctl() 

Sparse has warned us about wrong address space for user pointers:

  i2c-dev.c:561:50: warning: incorrect type in initializer (different address spaces)
  i2c-dev.c:561:50:    expected unsigned char [usertype] *buf
  i2c-dev.c:561:50:    got void [noderef] __user *

Force cast the pointer to (__u8 *) that is used by I²C core code.

Note, this is an additional fix to the previously addressed similar issue
in the I2C_RDWR case in the same function.

Fixes: 3265a7e6b4 ("i2c: dev: Add __user annotation")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
This commit is contained in:
Andy Shevchenko 2022-04-11 21:07:52 +03:00 committed by Wolfram Sang
parent 993eb48fa1
commit aef80e2fbe
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/i2c-dev.c
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@ -557,7 +557,7 @@ static long compat_i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned lo
.addr = umsg.addr,
.flags = umsg.flags,
.len = umsg.len,
.buf = compat_ptr(umsg.buf)
.buf = (__force __u8 *)compat_ptr(umsg.buf),
};
}