DivestOS/Patches/LineageOS-14.1/android_external_libavc/315711.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Rakesh Kumar <rakesh.kumar@ittiam.com>
Date: Wed, 28 Apr 2021 23:44:50 +0530
Subject: [PATCH] Decoder: Update check for increment u2_cur_slice_num

Increment u2_cur_slice_num only if current slice had atleast
one MB of memory left.

Test: clusterfuzz generated poc in bug
Bug: b/182152757
Bug: b/179938345
Bug: b/185112718

Change-Id: Ic5eb07e961bccb7fde954bcfd791fd879804e335
(cherry picked from commit a88e0683a420d7ee9aa4b6f41f94cb8dc0c5e040)
---
 decoder/ih264d_parse_slice.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/decoder/ih264d_parse_slice.c b/decoder/ih264d_parse_slice.c
index cf2dda9..ffe7f2b 100644
--- a/decoder/ih264d_parse_slice.c
+++ b/decoder/ih264d_parse_slice.c
@@ -1476,17 +1476,20 @@ WORD32 ih264d_parse_decode_slice(UWORD8 u1_is_idr_slice,
         i1_is_end_of_poc = 0;
     }
 
-    if (ps_dec->u4_first_slice_in_pic == 0)
+    /* Increment only if the current slice has atleast 1 more MB */
+    if (ps_dec->u4_first_slice_in_pic == 0 &&
+        (ps_dec->ps_parse_cur_slice->u4_first_mb_in_slice <
+        (UWORD32)(ps_dec->u2_total_mbs_coded >> ps_dec->ps_cur_slice->u1_mbaff_frame_flag)))
     {
         ps_dec->ps_parse_cur_slice++;
         ps_dec->u2_cur_slice_num++;
+        // in the case of single core increment ps_decode_cur_slice
+        if(ps_dec->u1_separate_parse == 0)
+        {
+            ps_dec->ps_decode_cur_slice++;
+        }
     }
 
-    // in the case of single core increment ps_decode_cur_slice
-    if((ps_dec->u1_separate_parse == 0) && (ps_dec->u4_first_slice_in_pic == 0))
-    {
-        ps_dec->ps_decode_cur_slice++;
-    }
     ps_dec->u1_slice_header_done = 0;