Messages in this thread Patch in this message | | | Subject | [PATCH] i2c-dev: Use memdup_user | From | Thomas Meyer <> | Date | Sat, 13 Aug 2011 10:17:06 +0200 |
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From: Thomas Meyer <thomas@m3y3r.de>
Use kmemdup_user rather than duplicating its implementation This is a little bit restricted to reduce false positives
The semantic patch that makes this output is available in scripts/coccinelle/api/memdup_user.cocci.
More information about semantic patching is available at http://coccinelle.lip6.fr/
Signed-off-by: Thomas Meyer <thomas@m3y3r.de> ---
diff -u -p a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c --- a/drivers/i2c/i2c-dev.c 2011-04-14 10:34:17.670994023 +0200 +++ b/drivers/i2c/i2c-dev.c 2011-08-01 22:08:25.888046385 +0200 @@ -251,15 +251,10 @@ static noinline int i2cdev_ioctl_rdrw(st if (rdwr_arg.nmsgs > I2C_RDRW_IOCTL_MAX_MSGS) return -EINVAL; - rdwr_pa = kmalloc(rdwr_arg.nmsgs * sizeof(struct i2c_msg), GFP_KERNEL); - if (!rdwr_pa) - return -ENOMEM; - - if (copy_from_user(rdwr_pa, rdwr_arg.msgs, - rdwr_arg.nmsgs * sizeof(struct i2c_msg))) { - kfree(rdwr_pa); - return -EFAULT; - } + rdwr_pa = memdup_user(rdwr_arg.msgs, + rdwr_arg.nmsgs * sizeof(struct i2c_msg)); + if (IS_ERR(rdwr_pa)) + return PTR_ERR(rdwr_pa); data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL); if (data_ptrs == NULL) {
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