atm: move copyin from atm_getnames() into the caller

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/net/atm/ioctl.c b/net/atm/ioctl.c
index 0b4b077..e239ceb 100644 (file)
--- a/net/atm/ioctl.c
+++ b/net/atm/ioctl.c
@@ -56,6 +56,8 @@ static int do_vcc_ioctl(struct socket *sock, unsigned int cmd,
        int error;
        struct list_head *pos;
        void __user *argp = (void __user *)arg;
+       void __user *buf;
+       int __user *len;
 
        vcc = ATM_SD(sock);
        switch (cmd) {
@@ -163,7 +165,22 @@ static int do_vcc_ioctl(struct socket *sock, unsigned int cmd,
                goto done;
 
        if (cmd == ATM_GETNAMES) {
-               error = atm_getnames(argp, compat);
+               if (IS_ENABLED(CONFIG_COMPAT) && compat) {
+#ifdef CONFIG_COMPAT
+                       struct compat_atm_iobuf __user *ciobuf = argp;
+                       compat_uptr_t cbuf;
+                       len = &ciobuf->length;
+                       if (get_user(cbuf, &ciobuf->buffer))
+                               return -EFAULT;
+                       buf = compat_ptr(cbuf);
+#endif
+               } else {
+                       struct atm_iobuf __user *iobuf = argp;
+                       len = &iobuf->length;
+                       if (get_user(buf, &iobuf->buffer))
+                               return -EFAULT;
+               }
+               error = atm_getnames(buf, len);
        } else {
                error = atm_dev_ioctl(cmd, argp, compat);
        }

diff --git a/net/atm/resources.c b/net/atm/resources.c
index a2ab759..5507cc6 100644 (file)
--- a/net/atm/resources.c
+++ b/net/atm/resources.c
@@ -193,30 +193,13 @@ static int fetch_stats(struct atm_dev *dev, struct atm_dev_stats __user *arg,
        return error ? -EFAULT : 0;
 }
 
-int atm_getnames(void __user *arg, int compat)
+int atm_getnames(void __user *buf, int __user *iobuf_len)
 {
-       void __user *buf;
        int error, len, size = 0;
        struct atm_dev *dev;
        struct list_head *p;
        int *tmp_buf, *tmp_p;
-       int __user *iobuf_len;
 
-       if (IS_ENABLED(CONFIG_COMPAT) && compat) {
-#ifdef CONFIG_COMPAT
-               struct compat_atm_iobuf __user *ciobuf = arg;
-               compat_uptr_t cbuf;
-               iobuf_len = &ciobuf->length;
-               if (get_user(cbuf, &ciobuf->buffer))
-                       return -EFAULT;
-               buf = compat_ptr(cbuf);
-#endif
-       } else {
-               struct atm_iobuf __user *iobuf = arg;
-               iobuf_len = &iobuf->length;
-               if (get_user(buf, &iobuf->buffer))
-                       return -EFAULT;
-       }
        if (get_user(len, iobuf_len))
                return -EFAULT;
        mutex_lock(&atm_dev_mutex);

diff --git a/net/atm/resources.h b/net/atm/resources.h
index 18f8e59..5e2c68d 100644 (file)
--- a/net/atm/resources.h
+++ b/net/atm/resources.h
@@ -14,7 +14,7 @@
 extern struct list_head atm_devs;
 extern struct mutex atm_dev_mutex;
 
-int atm_getnames(void __user *arg, int compat);
+int atm_getnames(void __user *buf, int __user *iobuf_len);
 int atm_dev_ioctl(unsigned int cmd, void __user *arg, int compat);