Subject: Re: [PATCH v3] apply.c: fix -p argument parsing

From: Junio C Hamano <[email-masked]>
Date: Tue, 10 Mar 2026 06:13:09 -0700

Mirko Faina <[email-masked]> writes:

>  apply.c               |  3 ++-
>  t/t4120-apply-popt.sh | 21 +++++++++++++++++++++
>  t/t4120/patch         | 16 ++++++++++++++++
>  3 files changed, 39 insertions(+), 1 deletion(-)
>  create mode 100644 t/t4120/patch

Yeah, 4120 is about the "-p" option, and is much better fit for the
tests for this input validation feature.  Good find.

Will queue.  Thanks.

> diff --git a/apply.c b/apply.c
> index b6dd1066a0..61df3bdcd0 100644
> --- a/apply.c
> +++ b/apply.c
> @@ -4981,7 +4981,8 @@ static int apply_option_parse_p(const struct option *opt,
>  
>  	BUG_ON_OPT_NEG(unset);
>  
> -	state->p_value = atoi(arg);
> +	if (strtol_i(arg, 10, &state->p_value) < 0 || state->p_value < 0)
> +		die("<num> has to be a non-negative integer");
>  	state->p_value_known = 1;
>  	return 0;
>  }
> diff --git a/t/t4120-apply-popt.sh b/t/t4120-apply-popt.sh
> index 697e86c0ff..3fdcfecc52 100755
> --- a/t/t4120-apply-popt.sh
> +++ b/t/t4120-apply-popt.sh
> @@ -23,6 +23,27 @@ test_expect_success setup '
>  	rmdir süb
>  '
>  
> +test_expect_success 'git apply -p 1 patch' '
> +	test_when_finished "rm -rf t" &&
> +	git apply -p 1 $TEST_DIRECTORY/t4120/patch &&
> +	test_path_is_dir t
> +'
> +
> +test_expect_success 'apply fails due to non-num -p' '
> +	test_when_finished "rm -rf t test" &&
> +	test_must_fail git apply -p malformed $TEST_DIRECTORY/t4120/patch
> +'
> +
> +test_expect_success 'apply fails due to trailing non-digit in -p' '
> +	test_when_finished "rm -rf t test" &&
> +	test_must_fail git apply -p 2q $TEST_DIRECTORY/t4120/patch
> +'
> +
> +test_expect_success 'apply fails due to negative number in -p' '
> +	test_when_finished "rm -rf t test" &&
> +	test_must_fail git apply -p -1 $TEST_DIRECTORY/t4120/patch
> +'
> +
>  test_expect_success 'apply git diff with -p2' '
>  	cp file1.saved file1 &&
>  	git apply -p2 patch.file
> diff --git a/t/t4120/patch b/t/t4120/patch
> new file mode 100644
> index 0000000000..c4511bb708
> --- /dev/null
> +++ b/t/t4120/patch
> @@ -0,0 +1,16 @@
> +From 90ad11d5b2d437e82d4d992f72fb44c2227798b5 Mon Sep 17 00:00:00 2001
> +From: Mroik <[email-masked]>
> +Date: Mon, 9 Mar 2026 23:25:00 +0100
> +Subject: [PATCH] Test
> +
> +---
> + t/test/test | 0
> + 1 file changed, 0 insertions(+), 0 deletions(-)
> + create mode 100644 t/test/test
> +
> +diff --git a/t/test/test b/t/test/test
> +new file mode 100644
> +index 0000000000..e69de29bb2
> +-- 
> +2.53.0.851.ga537e3e6e9
> +