When a command is invoked with both --exclude-promisor-objects,
--objects-edge-aggressive, and a missing object on the command line,
the rev_info.cmdline array could get a NULL pointer for the value of
an 'item' field. Prevent dereferencing of a NULL pointer in that
situation.

Properly handle --ignore-missing. If it is not passed, die when an
object is missing. Otherwise, just silently ignore it.

Signed-off-by: Matthew DeVore <matv...@google.com>
---
 revision.c               |  2 ++
 t/t0410-partial-clone.sh | 16 ++++++++++++++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/revision.c b/revision.c
index 13e0519c02..293303b67d 100644
--- a/revision.c
+++ b/revision.c
@@ -1729,6 +1729,8 @@ int handle_revision_arg(const char *arg_, struct rev_info 
*revs, int flags, unsi
        if (!cant_be_filename)
                verify_non_filename(revs->prefix, arg);
        object = get_reference(revs, arg, &oid, flags ^ local_flags);
+       if (!object)
+               return revs->ignore_missing ? 0 : -1;
        add_rev_cmdline(revs, object, arg_, REV_CMD_REV, flags ^ local_flags);
        add_pending_object_with_path(revs, object, arg, oc.mode, oc.path);
        free(oc.path);
diff --git a/t/t0410-partial-clone.sh b/t/t0410-partial-clone.sh
index ba3887f178..169f7f10a7 100755
--- a/t/t0410-partial-clone.sh
+++ b/t/t0410-partial-clone.sh
@@ -349,7 +349,7 @@ test_expect_success 'rev-list stops traversal at promisor 
commit, tree, and blob
        grep $(git -C repo rev-parse bar) out  # sanity check that some walking 
was done
 '
 
-test_expect_success 'rev-list accepts missing and promised objects on command 
line' '
+test_expect_success 'rev-list dies for missing objects on cmd line' '
        rm -rf repo &&
        test_create_repo repo &&
        test_commit -C repo foo &&
@@ -366,7 +366,19 @@ test_expect_success 'rev-list accepts missing and promised 
objects on command li
 
        git -C repo config core.repositoryformatversion 1 &&
        git -C repo config extensions.partialclone "arbitrary string" &&
-       git -C repo rev-list --exclude-promisor-objects --objects "$COMMIT" 
"$TREE" "$BLOB"
+
+       for OBJ in "$COMMIT" "$TREE" "$BLOB"; do
+               test_must_fail git -C repo rev-list --objects \
+                       --exclude-promisor-objects "$OBJ" &&
+               test_must_fail git -C repo rev-list --objects-edge-aggressive \
+                       --exclude-promisor-objects "$OBJ" &&
+
+               # Do not die or crash when --ignore-missing is passed.
+               git -C repo rev-list --ignore-missing --objects \
+                       --exclude-promisor-objects "$OBJ" &&
+               git -C repo rev-list --ignore-missing --objects-edge-aggressive 
\
+                       --exclude-promisor-objects "$OBJ"
+       done
 '
 
 test_expect_success 'gc repacks promisor objects separately from non-promisor 
objects' '
-- 
2.20.0.rc1.387.gf8505762e3-goog

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