diff options
| -rw-r--r-- | lib/iov_iter.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c index 12fb04b23143..c8877cffb7bc 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -965,9 +965,12 @@ static size_t __copy_page_to_iter(struct page *page, size_t offset, size_t bytes size_t wanted = copy_to_iter(kaddr + offset, bytes, i); kunmap_atomic(kaddr); return wanted; - } else if (unlikely(iov_iter_is_discard(i))) + } else if (unlikely(iov_iter_is_discard(i))) { + if (unlikely(i->count < bytes)) + bytes = i->count; + i->count -= bytes; return bytes; - else if (likely(!iov_iter_is_pipe(i))) + } else if (likely(!iov_iter_is_pipe(i))) return copy_page_to_iter_iovec(page, offset, bytes, i); else return copy_page_to_iter_pipe(page, offset, bytes, i); |