diff options
| -rw-r--r-- | include/linux/uio.h | 1 | ||||
| -rw-r--r-- | lib/iov_iter.c | 11 |
2 files changed, 12 insertions, 0 deletions
diff --git a/include/linux/uio.h b/include/linux/uio.h index 9f158238edba..73b1d5d1e4f1 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -346,6 +346,7 @@ ssize_t __import_iovec(int type, const struct iovec __user *uvec, struct iov_iter *i, bool compat); int import_single_range(int type, void __user *buf, size_t len, struct iovec *iov, struct iov_iter *i); +int import_ubuf(int type, void __user *buf, size_t len, struct iov_iter *i); static inline void iov_iter_ubuf(struct iov_iter *i, unsigned int direction, void __user *buf, size_t count) diff --git a/lib/iov_iter.c b/lib/iov_iter.c index f9a3ff37ecd1..f036760b66e2 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1877,6 +1877,17 @@ int import_single_range(int rw, void __user *buf, size_t len, } EXPORT_SYMBOL(import_single_range); +int import_ubuf(int rw, void __user *buf, size_t len, struct iov_iter *i) +{ + if (len > MAX_RW_COUNT) + len = MAX_RW_COUNT; + if (unlikely(!access_ok(buf, len))) + return -EFAULT; + + iov_iter_ubuf(i, rw, buf, len); + return 0; +} + /** * iov_iter_restore() - Restore a &struct iov_iter to the same state as when * iov_iter_save_state() was called. |