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From: Junio C Hamano <gitster@pobox.com>
To: Denton Liu <liu.denton@gmail.com>
Cc: Git Mailing List <git@vger.kernel.org>,
	Eric Sunshine <sunshine@sunshineco.com>
Subject: Re: [PATCH 2/2] stash show: fix segfault with --{include,only}-untracked
Date: Thu, 13 May 2021 08:48:55 +0900	[thread overview]
Message-ID: <xmqq35urecns.fsf@gitster.g> (raw)
In-Reply-To: <24de72b34de45980196ed6df8b64782887e94f36.1620850247.git.liu.denton@gmail.com> (Denton Liu's message of "Wed, 12 May 2021 13:16:13 -0700")

Denton Liu <liu.denton@gmail.com> writes:

> When `git stash show --include-untracked` or
> `git stash show --only-untracked` is run on a stash that doesn't include
> an untracked entry, a segfault occurs. This happens because we do not
> check whether the untracked entry is actually present and just attempt
> to blindly dereference it.
>
> Ensure that the untracked entry is present before actually attempting to
> dereference it.

Makes sense.  Thanks.

>
> Signed-off-by: Denton Liu <liu.denton@gmail.com>
> ---
>  builtin/stash.c                    |  8 ++++++--
>  t/t3905-stash-include-untracked.sh | 15 +++++++++++++++
>  2 files changed, 21 insertions(+), 2 deletions(-)
>
> diff --git a/builtin/stash.c b/builtin/stash.c
> index 8922a1240c..82e4829d44 100644
> --- a/builtin/stash.c
> +++ b/builtin/stash.c
> @@ -900,10 +900,14 @@ static int show_stash(int argc, const char **argv, const char *prefix)
>  		diff_tree_oid(&info.b_commit, &info.w_commit, "", &rev.diffopt);
>  		break;
>  	case UNTRACKED_ONLY:
> -		diff_root_tree_oid(&info.u_tree, "", &rev.diffopt);
> +		if (info.has_u)
> +			diff_root_tree_oid(&info.u_tree, "", &rev.diffopt);
>  		break;
>  	case UNTRACKED_INCLUDE:
> -		diff_include_untracked(&info, &rev.diffopt);
> +		if (info.has_u)
> +			diff_include_untracked(&info, &rev.diffopt);
> +		else
> +			diff_tree_oid(&info.b_commit, &info.w_commit, "", &rev.diffopt);
>  		break;
>  	}
>  	log_tree_diff_flush(&rev);
> diff --git a/t/t3905-stash-include-untracked.sh b/t/t3905-stash-include-untracked.sh
> index 2e6796725b..1c9765928d 100755
> --- a/t/t3905-stash-include-untracked.sh
> +++ b/t/t3905-stash-include-untracked.sh
> @@ -405,4 +405,19 @@ test_expect_success 'stash show --include-untracked errors on duplicate files' '
>  	test_i18ngrep "worktree and untracked commit have duplicate entries: tracked" err
>  '
>  
> +test_expect_success 'stash show --{include,only}-untracked on stashes without untracked entries' '
> +	git reset --hard &&
> +	git clean -xf &&
> +	>tracked &&
> +	git add tracked &&
> +	git stash &&
> +
> +	git stash show >expect &&
> +	git stash show --include-untracked >actual &&
> +	test_cmp expect actual &&
> +
> +	git stash show --only-untracked >actual &&
> +	test_must_be_empty actual
> +'
> +
>  test_done

      reply	other threads:[~2021-05-12 23:54 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-12 20:16 [PATCH 0/2] Fixes for dl/stash-show-untracked Denton Liu
2021-05-12 20:16 ` [PATCH 1/2] t3905: correct test title Denton Liu
2021-05-12 20:16 ` [PATCH 2/2] stash show: fix segfault with --{include,only}-untracked Denton Liu
2021-05-12 23:48   ` Junio C Hamano [this message]

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