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atm: switch do_atm_iobuf() to direct use of atm_getnames() 

... and sod the compat_alloc_user_space() with its complications

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2020-05-10 17:41:51 -04:00
parent a3929484af
commit 36085049bc
1 changed files with 3 additions and 22 deletions
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25
net/atm/ioctl.c
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@ -251,32 +251,13 @@ static struct {
static int do_atm_iobuf(struct socket *sock, unsigned int cmd,
unsigned long arg)
{
struct atm_iobuf __user *iobuf;
struct compat_atm_iobuf __user *iobuf32;
struct compat_atm_iobuf __user *iobuf32 = compat_ptr(arg);
u32 data;
void __user *datap;
int len, err;
iobuf = compat_alloc_user_space(sizeof(*iobuf));
iobuf32 = compat_ptr(arg);
if (get_user(len, &iobuf32->length) ||
get_user(data, &iobuf32->buffer))
return -EFAULT;
datap = compat_ptr(data);
if (put_user(len, &iobuf->length) ||
put_user(datap, &iobuf->buffer))
if (get_user(data, &iobuf32->buffer))
return -EFAULT;
err = do_vcc_ioctl(sock, cmd, (unsigned long) iobuf, 0);
if (!err) {
if (copy_in_user(&iobuf32->length, &iobuf->length,
sizeof(int)))
err = -EFAULT;
}
return err;
return atm_getnames(&iobuf32->length, compat_ptr(data));
}
static int do_atmif_sioc(struct socket *sock, unsigned int cmd,