CVE-2026-46289: lib/scatterlist: fix length calculations in extract_kvec_to_sg

In the Linux kernel, the following vulnerability has been resolved:

lib/scatterlist: fix length calculations in extractkvectosg

Patch series "Fix bugs in extractitertosg()", v3.

Fix bugs in the kvec and user variants of extractitertosg. This series is growing due to useful remarks made by sashiko.dev.

The main bugs are: - The length for an sglist entry when extracting from a kvec can exceed the number of bytes in the page. This is obviously not intended. - When extracting a user buffer the sglist is temporarily used as a scratch buffer for extracted page pointers. If the sglist already contains some elements this scratch buffer could overlap with existing entries in the sglist.

The series adds test cases to the kunitioviter test that demonstrate all of these bugs. Additionally, there is a memory leak fix for the test itself.

The bugs were orignally introduced into kernel v6.3 where the function lived in fs/netfs/iterator.c. It was later moved to lib/scatterlist.c in v6.5. Thus the actual fix is only marked for backports to v6.5+.

This patch (of 5):

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

Adjust the copied length if the loop runs out of sglist entries without extracting everything.

While there, return immediately from extractitertosg if there are no sglist entries at all.

A subsequent commit will add kunit test cases that demonstrate that the patch is necessary.