Reject values that don't fit into an int, as get_parent() and
get_nth_ancestor() cannot handle them. That's better than potentially
returning a random object.
If this restriction turns out to be too tight then we can switch to a
wider data type, but we'd still have to check for overflow.
Signed-off-by: René Scharfe <l.s.r@xxxxxx>
---
sha1-name.c | 15 ++++++++++++---
t/t1506-rev-parse-diagnosis.sh | 4 ++--
2 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/sha1-name.c b/sha1-name.c
index c665e3f96d..7a047e9e2b 100644
--- a/sha1-name.c
+++ b/sha1-name.c
@@ -1160,13 +1160,22 @@ static enum get_oid_result get_oid_1(struct repository *r,
}
if (has_suffix) {
- int num = 0;
+ unsigned int num = 0;
int len1 = cp - name;
cp++;
- while (cp < name + len)
- num = num * 10 + *cp++ - '0';
+ while (cp < name + len) {
+ unsigned int digit = *cp++ - '0';
+ if (unsigned_mult_overflows(num, 10))
+ return MISSING_OBJECT;
+ num *= 10;
+ if (unsigned_add_overflows(num, digit))
+ return MISSING_OBJECT;
+ num += digit;
+ }
if (!num && len1 == len - 1)
num = 1;
+ else if (num > INT_MAX)
+ return MISSING_OBJECT;
if (has_suffix == '^')
return get_parent(r, name, len1, oid, num);
/* else if (has_suffix == '~') -- goes without saying */
diff --git a/t/t1506-rev-parse-diagnosis.sh b/t/t1506-rev-parse-diagnosis.sh
index 5c4df47401..6a938b205b 100755
--- a/t/t1506-rev-parse-diagnosis.sh
+++ b/t/t1506-rev-parse-diagnosis.sh
@@ -215,11 +215,11 @@ test_expect_success 'arg before dashdash must be a revision (ambiguous)' '
test_cmp expect actual
'
-test_expect_failure 'reject Nth parent if N is too high' '
+test_expect_success 'reject Nth parent if N is too high' '
test_must_fail git rev-parse HEAD^100000000000000000000000000000000
'
-test_expect_failure 'reject Nth ancestor if N is too high' '
+test_expect_success 'reject Nth ancestor if N is too high' '
test_must_fail git rev-parse HEAD~100000000000000000000000000000000
'
--
2.23.0
