From: NiDU-NINJA <alnida1505@gmail.com>
Date: Sat, 7 Mar 2026 08:27:15 +0000 (+0000)
Subject: Fix potential NULL pointer dereference in ZSTD_customCalloc when custom allocator... 
X-Git-Url: http://git.ipfire.org/gitweb/?a=commitdiff_plain;h=refs%2Fpull%2F4613%2Fhead;p=thirdparty%2Fzstd.git

Fix potential NULL pointer dereference in ZSTD_customCalloc when custom allocator fails
---

diff --git a/lib/common/allocations.h b/lib/common/allocations.h
index 5e8995501..d4d392998 100644
--- a/lib/common/allocations.h
+++ b/lib/common/allocations.h
@@ -33,9 +33,13 @@ MEM_STATIC void* ZSTD_customMalloc(size_t size, ZSTD_customMem customMem)
 MEM_STATIC void* ZSTD_customCalloc(size_t size, ZSTD_customMem customMem)
 {
     if (customMem.customAlloc) {
-        /* calloc implemented as malloc+memset;
-         * not as efficient as calloc, but next best guess for custom malloc */
+        /* calloc implemented as malloc+memset */
         void* const ptr = customMem.customAlloc(customMem.opaque, size);
+
+        if (ptr == NULL) {
+            return NULL;
+        }
+
         ZSTD_memset(ptr, 0, size);
         return ptr;
     }