builtin/commit.c: extract ignore_non_trailer() helper function

diff --git a/patch-delta.c b/patch-delta.c
index d218faa02bd12b0e6a0df298a6a0e5787e46d93f..56e0a5ede22c9396fc897bf1d3444dce92d8916f 100644 (file)
--- a/patch-delta.c
+++ b/patch-delta.c
@@ -48,7 +48,7 @@ void *patch_delta(const void *src_buf, unsigned long src_size,
                        if (cmd & 0x20) cp_size |= (*data++ << 8);
                        if (cmd & 0x40) cp_size |= (*data++ << 16);
                        if (cp_size == 0) cp_size = 0x10000;
-                       if (cp_off + cp_size < cp_size ||
+                       if (unsigned_add_overflows(cp_off, cp_size) ||
                            cp_off + cp_size > src_size ||
                            cp_size > size)
                                break;