diff -r 591473851c95 -r 3d80d425543b src/mempool.c
--- a/src/mempool.c	Tue Jan 02 17:00:21 2018 +0100
+++ b/src/mempool.c	Sun Jan 21 10:13:21 2018 +0100
@@ -65,12 +65,17 @@
 }
 
 UcxMempool *ucx_mempool_new(size_t n) {
+    size_t poolsz;
+    if(ucx_szmul(n, sizeof(void*), &poolsz)) {
+        return NULL;
+    }
+    
     UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
     if (!pool) {
         return NULL;
     }
     
-    pool->data = (void**) malloc(n * sizeof(void*));
+    pool->data = (void**) malloc(poolsz);
     if (pool->data == NULL) {
         free(pool);
         return NULL;
@@ -100,7 +105,12 @@
         return 1;
     }
     
-    void **data = (void**) realloc(pool->data, newcap*sizeof(void*));
+    size_t newcapsz;
+    if(ucx_szmul(newcap, sizeof(void*), &newcapsz)) {
+        return 1;
+    }
+    
+    void **data = (void**) realloc(pool->data, newcapsz);
     if (data) {
         pool->data = data; 
         pool->size = newcap;
@@ -111,6 +121,10 @@
 }
 
 void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
+    if(((size_t)-1) - sizeof(ucx_destructor) < n) {
+        return NULL;
+    }
+    
     if (pool->ndata >= pool->size) {
         size_t newcap = pool->size*2;
         if (newcap < pool->size || ucx_mempool_chcap(pool, newcap)) {
@@ -132,7 +146,12 @@
 }
 
 void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {
-    void *ptr = ucx_mempool_malloc(pool, nelem*elsize);
+    size_t msz;
+    if(ucx_szmul(nelem, elsize, &msz)) {
+        return NULL;
+    }
+    
+    void *ptr = ucx_mempool_malloc(pool, msz);
     if (!ptr) {
         return NULL;
     }
@@ -141,6 +160,10 @@
 }
 
 void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {
+    if(((size_t)-1) - sizeof(ucx_destructor) < n) {
+        return NULL;
+    }
+    
     char *mem = ((char*)ptr) - sizeof(ucx_destructor);
     char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));
     if (!newm) {