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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
View file

@ -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:

33
net/atm/resources.c
View file

@ -227,39 +227,14 @@ int atm_getnames(void __user *buf, int __user *iobuf_len)
return error;
}
int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat)
int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len,
int number, int compat)
{
void __user *buf;
int error, len, number, size = 0;
int error, len, size = 0;
struct atm_dev *dev;
int __user *sioc_len;
if (IS_ENABLED(CONFIG_COMPAT) && compat) {
#ifdef CONFIG_COMPAT
struct compat_atmif_sioc __user *csioc = arg;
compat_uptr_t carg;
sioc_len = &csioc->length;
if (get_user(carg, &csioc->arg))
if (get_user(len, sioc_len))
return -EFAULT;
buf = compat_ptr(carg);
if (get_user(len, &csioc->length))
return -EFAULT;
if (get_user(number, &csioc->number))
return -EFAULT;
#endif
} else {
struct atmif_sioc __user *sioc = arg;
sioc_len = &sioc->length;
if (get_user(buf, &sioc->arg))
return -EFAULT;
if (get_user(len, &sioc->length))
return -EFAULT;
if (get_user(number, &sioc->number))
return -EFAULT;
}
dev = try_then_request_module(atm_dev_lookup(number), "atm-device-%d",
number);

4
net/atm/resources.h
View file

@ -15,8 +15,8 @@ extern struct list_head atm_devs;
extern struct mutex atm_dev_mutex;
int atm_getnames(void __user *buf, int __user *iobuf_len);
int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat);
int atm_dev_ioctl(unsigned int cmd, void __user *buf, int __user *sioc_len,
int number, int compat);
#ifdef CONFIG_PROC_FS