Re: [PATCH RESEND 0/3] Fix length calculation bug in extract_kvec_to_sg

[Josh Law]

On Mon, 23 Mar 2026 22:23:47 +0100, Christian A. Ehrhardt wrote:
> There is a bug in extract_kvec_to_sg() where the length
> of a scatterlist segment is miscalculated. The actual fix
> is a one-liner and it is quite obvious from reading the
> code that this is what was intened.
> 
> As this is a core library function this series first adds
> test cases to the kunit_iov_iter test that demonstrate that
> there is a bug before actually fixing it in the last commit.
> 
> The bug was 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+.
> 
> Christian A. Ehrhardt (3):
>   lib: kunit_iov_iter: Improve error detection
>   lib: kunit_iov_iter: Add tests for extract_iter_to_sg
>   lib: Fix length calculation in extract_kvec_to_sg
> 
>  lib/scatterlist.c          |   2 +-
>  lib/tests/kunit_iov_iter.c | 147 ++++++++++++++++++++++++++++++++++++-
>  2 files changed, 147 insertions(+), 2 deletions(-)

Reviewed-by: Josh Law <objecting@xxxxxxxxxxxxx>