From a699ed6f1f977dcc4a49452a247cf21dc9cec3f9 Mon Sep 17 00:00:00 2001 From: Thomas Meyer Date: Thu, 12 Jan 2012 20:32:04 +0100 Subject: [PATCH] i2c-dev: Use memdup_user Use memdup_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 Signed-off-by: Jean Delvare --- drivers/i2c/i2c-dev.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index 57a45ce84b2d..10e7f1e76586 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -251,15 +251,10 @@ static noinline int i2cdev_ioctl_rdrw(struct i2c_client *client, 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) { -- 2.39.5