diff -r 411cf6fd268f -r d06aa9db0408 src/allocator.c
--- a/src/allocator.c	Fri Dec 05 16:22:57 2025 +0100
+++ b/src/allocator.c	Fri Dec 05 16:36:10 2025 +0100
@@ -108,6 +108,11 @@
         void **mem,
         size_t n
 ) {
+    if (n == 0) {
+        free(*mem);
+        *mem = NULL;
+        return 0;
+    }
     void *nmem = realloc(*mem, n);
     if (nmem == NULL) {
         return 1; // LCOV_EXCL_LINE
@@ -122,6 +127,11 @@
         size_t nmemb,
         size_t size
 ) {
+    if (nmemb == 0 || size == 0) {
+        free(*mem);
+        *mem = NULL;
+        return 0;
+    }
     size_t n;
     if (cx_szmul(nmemb, size, &n)) {
         errno = EOVERFLOW;
@@ -185,6 +195,11 @@
         void **mem,
         size_t n
 ) {
+    if (n == 0) {
+        cxFree(allocator, *mem);
+        *mem = NULL;
+        return 0;
+    }
     void *nmem = allocator->cl->realloc(allocator->data, *mem, n);
     if (nmem == NULL) {
         return 1; // LCOV_EXCL_LINE
@@ -200,6 +215,11 @@
         size_t nmemb,
         size_t size
 ) {
+    if (nmemb == 0 || size == 0) {
+        cxFree(allocator, *mem);
+        *mem = NULL;
+        return 0;
+    }
     void *nmem = cxReallocArray(allocator, *mem, nmemb, size);
     if (nmem == NULL) {
         return 1; // LCOV_EXCL_LINE