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-rw-r--r--mm/filemap.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 89ce6fe5f8be..76bea88cbebc 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1750,7 +1750,11 @@ static void __iov_iter_advance_iov(struct iov_iter *i, size_t bytes)
const struct iovec *iov = i->iov;
size_t base = i->iov_offset;
- while (bytes) {
+ /*
+ * The !iov->iov_len check ensures we skip over unlikely
+ * zero-length segments.
+ */
+ while (bytes || !iov->iov_len) {
int copy = min(bytes, iov->iov_len - base);
bytes -= copy;
@@ -2268,6 +2272,7 @@ again:
cond_resched();
+ iov_iter_advance(i, copied);
if (unlikely(copied == 0)) {
/*
* If we were unable to copy any data at all, we must
@@ -2281,7 +2286,6 @@ again:
iov_iter_single_seg_count(i));
goto again;
}
- iov_iter_advance(i, copied);
pos += copied;
written += copied;