Fix unchecked calloc result in tree_open

If calloc fails, t would be NULL and immediately dereferenced.
Return NULL on allocation failure.

diff --git a/libarchive/archive_read_disk_windows.c b/libarchive/archive_read_disk_windows.c
index 77687149febc379b346e2e83d7c06c83cf490291..c6a2aa65036bea4971943f20c0f6f357a9076336 100644 (file)
--- a/libarchive/archive_read_disk_windows.c
+++ b/libarchive/archive_read_disk_windows.c
@@ -1708,6 +1708,8 @@ tree_open(const wchar_t *path, int symlink_mode, int restore_time)
        struct tree *t;
 
        t = calloc(1, sizeof(*t));
+       if (t == NULL)
+               return (NULL);
        archive_string_init(&(t->full_path));
        archive_string_init(&t->path);
        if (archive_wstring_ensure(&t->path, 15) == NULL) {