diff --git a/media/libdav1d/moz.yaml b/media/libdav1d/moz.yaml
--- a/media/libdav1d/moz.yaml
+++ b/media/libdav1d/moz.yaml
@@ -18,15 +18,15 @@
   # Usually different from repository url
   url: https://code.videolan.org/videolan/dav1d
 
   # Human-readable identifier for this version/release
   # Generally "version NNN", "tag SSS", "bookmark SSS"
-  release: cd5e415270285a58f48c1e9ec1a2dd024b9acf9f (2022-08-19T13:58:13.000-03:00).
+  release: a3a55b18494f5dd1e34f289298f78ffa4f32a25d (2022-08-30T17:31:28.000+02:00).
 
   # Revision to pull in
   # Must be a long or short commit SHA (long preferred)
-  revision: cd5e415270285a58f48c1e9ec1a2dd024b9acf9f
+  revision: a3a55b18494f5dd1e34f289298f78ffa4f32a25d
 
   # The package's license, where possible using the mnemonic from
   # https://spdx.org/licenses/
   # Multiple licenses can be specified (as a YAML list)
   # A "LICENSE" file must exist containing the full license text
diff --git a/media/libdav1d/vcs_version.h b/media/libdav1d/vcs_version.h
--- a/media/libdav1d/vcs_version.h
+++ b/media/libdav1d/vcs_version.h
@@ -1,2 +1,2 @@
 /* auto-generated, do not edit */
-#define DAV1D_VERSION "cd5e415270285a58f48c1e9ec1a2dd024b9acf9f"
+#define DAV1D_VERSION "a3a55b18494f5dd1e34f289298f78ffa4f32a25d"
diff --git a/third_party/dav1d/src/thread_task.c b/third_party/dav1d/src/thread_task.c
--- a/third_party/dav1d/src/thread_task.c
+++ b/third_party/dav1d/src/thread_task.c
@@ -190,17 +190,18 @@
         f->frame_thread.entropy_progress = 0;
     } else {
         const int prog_sz = ((f->sbh + 31) & ~31) >> 5;
         if (prog_sz > f->frame_thread.prog_sz) {
             atomic_uint *const prog = realloc(f->frame_thread.frame_progress,
-                                              prog_sz * 2 * sizeof(*prog));
+                                              2 * prog_sz * sizeof(*prog));
             if (!prog) return -1;
             f->frame_thread.frame_progress = prog;
             f->frame_thread.copy_lpf_progress = prog + prog_sz;
             f->frame_thread.prog_sz = prog_sz;
         }
-        memset(f->frame_thread.frame_progress, 0, prog_sz * 2 * sizeof(atomic_uint));
+        memset(f->frame_thread.frame_progress, 0, prog_sz * sizeof(atomic_uint));
+        memset(f->frame_thread.copy_lpf_progress, 0, prog_sz * sizeof(atomic_uint));
         atomic_store(&f->frame_thread.deblock_progress, 0);
     }
     f->frame_thread.next_tile_row[pass & 1] = 0;
 
     Dav1dTask *t = &tasks[0];