[PATCH v3] apply.c: fix -p argument parsing
From: Mirko Faina <hidden>
Date: 2026-03-10 05:06:44
Subsystem:
the rest · Maintainer:
Linus Torvalds
"git apply" has an option -p that takes an integer as its argument. Unfortunately the function apply_option_parse_p() in charge of parsing this argument uses atoi() to convert from string to integer, which allows a non-digit after the number (e.g. "1q") to be silently ignored. As a consequence, an argument that does not begin with a digit silently becomes a zero. Despite this command working fine when a non-positive argument is passed, it might be useful for the end user to know that their input contains non-digits that might've been unintended. Replace atoi() with strtol_i() to catch malformed inputs. Signed-off-by: Mirko Faina <redacted> --- 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
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 <mroik@delayed.space> +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 +
--
2.53.0.316.gd563ecec28