[PATCH 3/3] lib: Fix length calculation in extract_kvec_to_sg

[Christian A. Ehrhardt]

When extracting from a kvec to a scatterlist, do not
cross page boundaries. The required length is already
calculated but not used as intended.

The previous changes to the kunit_iov_iter.c demonstrate
that the patch is necessary.

Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v6.5+
Fixes: 018584697533 ("netfs: Add a function to extract an iterator into a scatterlist")
Signed-off-by: Christian A. Ehrhardt <lk@xxxxxxx>
---
 lib/scatterlist.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 21bc9c1f7c06..73893ee0d92d 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -1249,7 +1249,7 @@ static ssize_t extract_kvec_to_sg(struct iov_iter *iter,
 			else
 				page = virt_to_page((void *)kaddr);
 
-			sg_set_page(sg, page, len, off);
+			sg_set_page(sg, page, seg, off);
 			sgtable->nents++;
 			sg++;
 			sg_max--;
-- 
2.43.0