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-rw-r--r--read-cache.c2
-rwxr-xr-xt/t2107-update-index-basic.sh19
2 files changed, 21 insertions, 0 deletions
diff --git a/read-cache.c b/read-cache.c
index 274e54b..5ae7f2b 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -1615,6 +1615,8 @@ int write_index(struct index_state *istate, int newfd)
continue;
if (!ce_uptodate(ce) && is_racy_timestamp(istate, ce))
ce_smudge_racily_clean_entry(ce);
+ if (is_null_sha1(ce->sha1))
+ return error("cache entry has null sha1: %s", ce->name);
if (ce_write_entry(&c, newfd, ce) < 0)
return -1;
}
diff --git a/t/t2107-update-index-basic.sh b/t/t2107-update-index-basic.sh
index 809fafe..0dbbb00 100755
--- a/t/t2107-update-index-basic.sh
+++ b/t/t2107-update-index-basic.sh
@@ -29,4 +29,23 @@ test_expect_success 'update-index -h with corrupt index' '
grep "[Uu]sage: git update-index" broken/usage
'
+test_expect_success '--cacheinfo does not accept blob null sha1' '
+ echo content >file &&
+ git add file &&
+ git rev-parse :file >expect &&
+ test_must_fail git update-index --cacheinfo 100644 $_z40 file &&
+ git rev-parse :file >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success '--cacheinfo does not accept gitlink null sha1' '
+ git init submodule &&
+ (cd submodule && test_commit foo) &&
+ git add submodule &&
+ git rev-parse :submodule >expect &&
+ test_must_fail git update-index --cacheinfo 160000 $_z40 submodule &&
+ git rev-parse :submodule >actual &&
+ test_cmp expect actual
+'
+
test_done