From: Julia Lawall <julia@xxxxxxx> Use memdup_user when user data is immediately copied into the allocated region. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression from,to,size,flag; position p; identifier l1,l2; @@ - to = \(kmalloc@p\|kzalloc@p\)(size,flag); + to = memdup_user(from,size); if ( - to==NULL + IS_ERR(to) || ...) { <+... when != goto l1; - -ENOMEM + PTR_ERR(to) ...+> } - if (copy_from_user(to, from, size) != 0) { - <+... when != goto l2; - -EFAULT - ...+> - } // </smpl> Signed-off-by: Julia Lawall <julia@xxxxxxx> --- drivers/net/wan/sdla.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/drivers/net/wan/sdla.c b/drivers/net/wan/sdla.c index 43ae6f4..258efc2 100644 --- a/drivers/net/wan/sdla.c +++ b/drivers/net/wan/sdla.c @@ -1211,14 +1211,9 @@ static int sdla_xfer(struct net_device *dev, struct sdla_mem __user *info, int r } else { - temp = kmalloc(mem.len, GFP_KERNEL); - if (!temp) - return(-ENOMEM); - if(copy_from_user(temp, mem.data, mem.len)) - { - kfree(temp); - return -EFAULT; - } + temp = memdup_user(mem.data, mem.len); + if (IS_ERR(temp)) + return PTR_ERR(temp); sdla_write(dev, mem.addr, temp, mem.len); kfree(temp); } -- To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
