From: Owen Smith <owen.smith@cloud.com>
Date: Mon, 17 Apr 2023 13:24:39 +0000 (+0100)
Subject: Check for zero byte allocations
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=7429e66ff12776a97b2733eb75ac7744609b6359;p=pvdrivers%2Fwin%2Fxencons.git

Check for zero byte allocations

Avoid attempting to allocate zero byte buffers, which can lead to
inefficiencies in pool memory usage.

Suggested-by: Matthew Sykes <matthew.sykes@citrix.com>
Signed-off-by: Owen Smith <owen.smith@cloud.com>
---

diff --git a/src/xencons/util.h b/src/xencons/util.h
index db52083..bea51aa 100644
--- a/src/xencons/util.h
+++ b/src/xencons/util.h
@@ -153,6 +153,9 @@ __AllocatePoolWithTag(
     __analysis_assume(PoolType == NonPagedPool ||
                       PoolType == PagedPool);
 
+    if (NumberOfBytes == 0)
+        return NULL;
+
 #if (_MSC_VER >= 1928) // VS 16.9 (EWDK 20344 or later)
     Buffer = ExAllocatePoolUninitialized(PoolType, NumberOfBytes, Tag);
 #else