From: richardsonnick <nic.rr@icloud.com>
Date: Tue, 23 Dec 2025 21:40:02 +0000 (-0500)
Subject: correct mmap error check
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=bb1eedcf866e0abdd34b157d83e19d76eb82a6f7;p=thirdparty%2Fzstd.git

correct mmap error check

Update mmap error validation to check for MAP_FAILED instead of NULL.
POSIX specifies that mmap returns MAP_FAILED (-1) on failure.
---

diff --git a/programs/fileio.c b/programs/fileio.c
index 4000c5b62..a0dcad817 100644
--- a/programs/fileio.c
+++ b/programs/fileio.c
@@ -1050,7 +1050,9 @@ static size_t FIO_setDictBufferMMap(FIO_Dict_t* dict, const char* fileName, FIO_
     }
 
     *bufferPtr = mmap(NULL, (size_t)fileSize, PROT_READ, MAP_PRIVATE, fileHandle, 0);
-    if (*bufferPtr==NULL) EXM_THROW(34, "%s", strerror(errno));
+    if (*bufferPtr == MAP_FAILED) {
+      EXM_THROW(34, "%s", strerror(errno))
+    }
 
     close(fileHandle);
     return (size_t)fileSize;