avcodec/hevcdec: Check allocation

Also postpone it after the checks for invalid input.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/hevcdec.c

@@ -2649,8 +2649,6 @@ static int hls_slice_data_wpp(HEVCContext *s, const H2645NAL *nal)
         goto error;
     }
 
-    ff_alloc_entries(s->avctx, s->sh.num_entry_point_offsets + 1);
-
     for (i = 1; i < s->threads_number; i++) {
         if (s->HEVClcList[i])
             continue;
@@ -2704,6 +2702,9 @@ static int hls_slice_data_wpp(HEVCContext *s, const H2645NAL *nal)
     }
 
     atomic_store(&s->wpp_err, 0);
+    res = ff_alloc_entries(s->avctx, s->sh.num_entry_point_offsets + 1);
+    if (res < 0)
+        goto error;
     ff_reset_entries(s->avctx);
 
     for (i = 0; i <= s->sh.num_entry_point_offsets; i++) {