On Tue, Oct 2, 2018 at 10:55 AM Phillip Wood <phillip.wood@xxxxxxxxxxxx> wrote:
>
> From: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>
>
> When adjusting the start of the string to take account of the change
> in indentation the code was not checking that the string being
> adjusted was in fact longer than the indentation change. This was
> detected by asan.
>
> Signed-off-by: Phillip Wood <phillip.wood@xxxxxxxxxxxxx>
> ---
> diff.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/diff.c b/diff.c
> index 5a08d64497..0096bdc339 100644
> --- a/diff.c
> +++ b/diff.c
> @@ -841,7 +841,7 @@ static int cmp_in_block_with_wsd(const struct diff_options *o,
> al -= wslen;
> }
>
> - if (strcmp(a, c))
> + if (al < 0 || al != cl || memcmp(a, c, al))
If (al < 0) then al != cl, so I would think we could drop the first
part, and only check with al != cl || memcmp
In theory we should use xdiff_compare_lines here
as the rest of the lines could have more white space issues,
but we catch that earlier via a die("color-moved-ws:
allow-indentation-change cannot be combined with other
white space modes"), so memcmp is fine.
Side note: There are comments above this code that seem
to be also obsolete after patch 1 ("...carried forward in
pmb->wsd; ...)
