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atm: lift copyin from atm_dev_ioctl()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2020-05-10 17:53:35 -04:00
parent 36085049bc
commit 8cacb41659
3 changed files with 31 additions and 33 deletions
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25
net/atm/ioctl.c
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@@ -182,7 +182,30 @@ static int do_vcc_ioctl(struct socket *sock, unsigned int cmd,
}
error = atm_getnames(buf, len);
} else {
error = atm_dev_ioctl(cmd, argp, compat);
int number;
if (IS_ENABLED(CONFIG_COMPAT) && compat) {
#ifdef CONFIG_COMPAT
struct compat_atmif_sioc __user *csioc = argp;
compat_uptr_t carg;
len = &csioc->length;
if (get_user(carg, &csioc->arg))
return -EFAULT;
buf = compat_ptr(carg);
if (get_user(number, &csioc->number))
return -EFAULT;
#endif
} else {
struct atmif_sioc __user *sioc = argp;
len = &sioc->length;
if (get_user(buf, &sioc->arg))
return -EFAULT;
if (get_user(number, &sioc->number))
return -EFAULT;
}
error = atm_dev_ioctl(cmd, buf, len, number, compat);
}
done: