index: check for valid filemodes on addcmn/index-add-modes

1 files changed, 14 insertions, 0 deletions

diff --git a/src/index.c b/src/index.c
index 8a7f29279..b63a0bec6 100644
--- a/src/index.c
+++ b/src/index.c
@@ -1104,6 +1104,15 @@ int git_index_remove_bypath(git_index *index, const char *path)
 	return 0;
 }
 
+static bool valid_filemode(const int filemode)
+{
+	return (filemode == GIT_FILEMODE_BLOB ||
+		filemode == GIT_FILEMODE_BLOB_EXECUTABLE ||
+		filemode == GIT_FILEMODE_LINK ||
+		filemode == GIT_FILEMODE_COMMIT);
+}
+
+
 int git_index_add(git_index *index, const git_index_entry *source_entry)
 {
 	git_index_entry *entry = NULL;
@@ -1111,6 +1120,11 @@ int git_index_add(git_index *index, const git_index_entry *source_entry)
 
 	assert(index && source_entry && source_entry->path);
 
+	if (!valid_filemode(source_entry->mode)) {
+		giterr_set(GITERR_INDEX, "invalid filemode");
+		return -1;
+	}
+
 	if ((ret = index_entry_dup(&entry, source_entry)) < 0 ||
 		(ret = index_insert(index, &entry, 1)) < 0)
 		return ret;