DoS error - Bitstream Overflow

The decoder could go into an infinite loop if there was an error
encountered after the bitstream buffer had been exhausted. Adding a check
for the same.

Bug: 63316255
Test: re-ran POC after patching
Change-Id: Iebef469ef663781b741889a055a70f261915b23a
(cherry picked from commit d1a1d7b88203a240488633e3a9b4cde231c3c4e3)

decoder/impeg2d_dec_hdr.c

diff --git a/decoder/impeg2d_dec_hdr.c b/decoder/impeg2d_dec_hdr.c
index e35a8bb..ff42a32 100644
--- a/decoder/impeg2d_dec_hdr.c
+++ b/decoder/impeg2d_dec_hdr.c
@@ -969,6 +969,11 @@
             if ((IMPEG2D_ERROR_CODES_T)IVD_ERROR_NONE != e_error)
             {
                 impeg2d_next_start_code(ps_dec);
+                if(ps_dec->s_bit_stream.u4_offset >= ps_dec->s_bit_stream.u4_max_offset)
+                {
+                    ps_dec->u4_error_code = IMPEG2D_BITSTREAM_BUFF_EXCEEDED_ERR;
+                    return;
+                }
             }
         }
 
@@ -1350,8 +1355,6 @@
     WORD32 i;
     dec_state_multi_core_t *ps_dec_state_multi_core;
 
-    UWORD32  u4_error_code;
-
     dec_state_t *ps_dec_thd;
     WORD32 i4_status;
     WORD32 i4_min_mb_y;
@@ -1359,7 +1362,6 @@
 
     /* Resetting the MB address and MB coordinates at the start of the Frame */
     ps_dec->u2_mb_x = ps_dec->u2_mb_y = 0;
-    u4_error_code = 0;
 
     ps_dec_state_multi_core = ps_dec->ps_dec_state_multi_core;
     impeg2d_get_slice_pos(ps_dec_state_multi_core);
@@ -1403,8 +1405,6 @@
         }
     }
 
-    ps_dec->u4_error_code = u4_error_code;
-
 }
 /*******************************************************************************
 *