From bbb46304786e4cb8b68ca2bcbdf66a649d135b97 Mon Sep 17 00:00:00 2001
From: Yash Patil <yash.patil@ittiam.com>
Date: Mon, 11 Sep 2023 18:49:02 +0530
Subject: [PATCH] Fix for Undefined-shift in ixheaacd_windowing_short2

These changes handle the Undefined-shift runtime error
reported because the value of shift was coming
greater than 31.

Bug: ossFuzz:61678
Test: poc in bug
---
 decoder/ixheaacd_imdct.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/decoder/ixheaacd_imdct.c b/decoder/ixheaacd_imdct.c
index c8d17de..fb868db 100644
--- a/decoder/ixheaacd_imdct.c
+++ b/decoder/ixheaacd_imdct.c
@@ -392,6 +392,9 @@ static IA_ERRORCODE ixheaacd_fd_imdct_short(ia_usac_data_struct *usac_data,
   ixheaacd_normalize(p_in_ibuffer, max_shift - 1, ixheaacd_drc_offset->n_long);
   shiftp += max_shift - 1;
 
+  if ((shiftp - shift_olap) > 31) {
+    shiftp = 31 + shift_olap;
+  }
   err_code = ixheaacd_calc_window(&window_short, ixheaacd_drc_offset->n_short,
                                   window_select, usac_data->ec_flag);
   if (err_code == -1) return err_code;