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diff --git a/deps/libchdr/deps/zstd-1.5.5/tests/fuzz/regression_driver.c b/deps/libchdr/deps/zstd-1.5.5/tests/fuzz/regression_driver.c
new file mode 100644
index 00000000..550c65d8
--- /dev/null
+++ b/deps/libchdr/deps/zstd-1.5.5/tests/fuzz/regression_driver.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+#include "fuzz.h"
+#include "fuzz_helpers.h"
+#include "util.h"
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char const **argv) {
+  size_t const kMaxFileSize = (size_t)1 << 27;
+  int const kFollowLinks = 1;
+  FileNamesTable* files;
+  const char** const fnTable = argv + 1;
+  uint8_t *buffer = NULL;
+  size_t bufferSize = 0;
+  unsigned i;
+  unsigned numFilesTested = 0;
+  int ret = 0;
+
+  {
+    unsigned const numFiles = (unsigned)(argc - 1);
+#ifdef UTIL_HAS_CREATEFILELIST
+    files = UTIL_createExpandedFNT(fnTable, numFiles, kFollowLinks);
+#else
+    files = UTIL_createFNT_fromROTable(fnTable, numFiles);
+    assert(numFiles == files->tableSize);
+#endif
+  }
+  if (!files) {
+    fprintf(stderr, "ERROR: Failed to create file names table\n");
+    return 1;
+  }
+  if (files->tableSize == 0)
+    fprintf(stderr, "WARNING: No files passed to %s\n", argv[0]);
+  for (i = 0; i < files->tableSize; ++i) {
+    char const *fileName = files->fileNames[i];
+    DEBUGLOG(3, "Running %s", fileName);
+    size_t const fileSize = UTIL_getFileSize(fileName);
+    size_t readSize;
+    FILE *file;
+
+    /* Check that it is a regular file, and that the fileSize is valid.
+     * If it is not a regular file, then it may have been deleted since we
+     * constructed the list, so just skip it, but return an error exit code.
+     */
+    if (!UTIL_isRegularFile(fileName)) {
+      ret = 1;
+      continue;
+    }
+    FUZZ_ASSERT_MSG(fileSize <= kMaxFileSize, fileName);
+    /* Ensure we have a large enough buffer allocated */
+    if (fileSize > bufferSize) {
+      free(buffer);
+      buffer = (uint8_t *)malloc(fileSize);
+      FUZZ_ASSERT_MSG(buffer, fileName);
+      bufferSize = fileSize;
+    }
+    /* Open the file */
+    file = fopen(fileName, "rb");
+    FUZZ_ASSERT_MSG(file, fileName);
+    /* Read the file */
+    readSize = fread(buffer, 1, fileSize, file);
+    FUZZ_ASSERT_MSG(readSize == fileSize, fileName);
+    /* Close the file */
+    fclose(file);
+    /* Run the fuzz target */
+    LLVMFuzzerTestOneInput(buffer, fileSize);
+    ++numFilesTested;
+  }
+  fprintf(stderr, "Tested %u files: ", numFilesTested);
+  if (ret == 0) {
+    fprintf(stderr, "Success!\n");
+  } else {
+    fprintf(stderr, "Failure!\n");
+  }
+  free(buffer);
+  UTIL_freeFileNamesTable(files);
+  return ret;
+}