lib-mail: Fix memory leak in istream-header-filter

Broken by 1c1b77dbf9a548aac788efb76973ce2d0fa6c732

diff --git a/src/lib-mail/istream-header-filter.c b/src/lib-mail/istream-header-filter.c
index 4c5638c9cd19369fe78c5cb780fc4522ac297ff0..8bc28fb94160d533f752e22c3795675fba173020 100644 (file)
--- a/src/lib-mail/istream-header-filter.c
+++ b/src/lib-mail/istream-header-filter.c
@@ -68,6 +68,11 @@ static void i_stream_header_filter_destroy(struct iostream_private *stream)
                array_free(&mstream->match_change_lines);
        if (!mstream->snapshot_pending)
                buffer_free(&mstream->hdr_buf);
+       else {
+               /* Clear hdr_buf to make sure
+                  i_stream_header_filter_snapshot_free() frees it. */
+               mstream->hdr_buf = NULL;
+       }
        pool_unref(&mstream->pool);
 }