A20-flac-encoder-crash.patch

--- a/libavcodec/flacenc.c.orig	2018-02-12 16:25:59.000000000 -0500
+++ b/libavcodec/flacenc.c	2018-04-25 21:14:15.000000000 -0400
@@ -606,7 +606,7 @@
 
 
 static void calc_sums(int pmin, int pmax, uint32_t *data, int n, int pred_order,
-                      uint64_t sums[][MAX_PARTITIONS])
+                      uint64_t **sums)
 {
     int i, j;
     int parts;
@@ -638,14 +638,24 @@
     int i;
     uint64_t bits[MAX_PARTITION_ORDER+1];
     int opt_porder;
-    RiceContext tmp_rc;
-    uint64_t sums[MAX_PARTITION_ORDER + 1][MAX_PARTITIONS] = { { 0 } };
+    RiceContext *tmp_rc;
+    uint64_t **sums;
 
     assert(pmin >= 0 && pmin <= MAX_PARTITION_ORDER);
     assert(pmax >= 0 && pmax <= MAX_PARTITION_ORDER);
     assert(pmin <= pmax);
 
-    tmp_rc.coding_mode = rc->coding_mode;
+    sums = calloc(1, (MAX_PARTITION_ORDER + 1) * sizeof(uint64_t*));
+    assert(sums);
+    for (i = 0; i < (MAX_PARTITION_ORDER + 1); i++) {
+        sums[i] = calloc(1, MAX_PARTITIONS * sizeof(uint64_t));
+        assert(sums[i] != NULL);
+    }
+
+    tmp_rc = malloc(sizeof(RiceContext));
+    assert(tmp_rc != NULL);
+
+    tmp_rc->coding_mode = rc->coding_mode;
 
     for (i = 0; i < n; i++)
         rc->udata[i] = (2 * data[i]) ^ (data[i] >> 31);
@@ -655,13 +665,17 @@
     opt_porder = pmin;
     bits[pmin] = UINT32_MAX;
     for (i = pmin; i <= pmax; i++) {
-        bits[i] = calc_optimal_rice_params(&tmp_rc, i, sums[i], n, pred_order);
+        bits[i] = calc_optimal_rice_params(tmp_rc, i, sums[i], n, pred_order);
         if (bits[i] <= bits[opt_porder]) {
             opt_porder = i;
-            *rc = tmp_rc;
+            *rc = *tmp_rc;
         }
     }
 
+    for (i = 0; i < (MAX_PARTITION_ORDER + 1); i++)
+        free(sums[i]);
+    free(sums);
+    free(tmp_rc);
     return bits[opt_porder];
 }