Re: git show loop

> Subject: [PATCH] combine-diff: fix loop index underflow
>
> If both la and context are zero at the start of the loop, la wraps around
> and we end up reading from memory far away.  Skip the loop in that case
> instead.
>
> Reported-by: Julia Lawall <julia.lawall@lip6.fr>
> Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
> ---

>  combine-diff.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/combine-diff.c b/combine-diff.c
> index a2e8dcf..9786680 100644
> --- a/combine-diff.c
> +++ b/combine-diff.c
> @@ -423,7 +423,7 @@ static int make_hunks(struct sline *sline, unsigned long cnt,
>  						     hunk_begin, j);
>  				la = (la + context < cnt + 1) ?
>  					(la + context) : cnt + 1;
> -				while (j <= --la) {
> +				while (la && j <= --la) {
>  					if (sline[la].flag & mark) {
>  						contin = 1;
>  						break;