From 6f13cb7b2b26e511181e7494bda8a106577700e7 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Fri, 17 May 2024 10:42:09 +0200
Subject: [cmake] Quote variable to avoid misleading error if empty

---
 cmake/FindKernelHeaders.cmake | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/cmake/FindKernelHeaders.cmake b/cmake/FindKernelHeaders.cmake
index c04243e..ce71aa8 100644
--- a/cmake/FindKernelHeaders.cmake
+++ b/cmake/FindKernelHeaders.cmake
@@ -31,10 +31,10 @@ find_path(KernelHeaders_INCLUDE_DIR
 
 # get Linux kernel headers version
 file(READ "${KERNEL_BUILD_DIR}/include/generated/utsrelease.h" tmpvar)
-string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" KernelHeaders_VERSION ${tmpvar})
+string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" KernelHeaders_VERSION "${tmpvar}")
 if("${KernelHeaders_VERSION}" EQUAL "")
     file(READ "${KERNEL_BUILD_DIR}/include/config/kernel.release" tmpvar)
-    string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" KernelHeaders_VERSION ${tmpvar})
+    string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" KernelHeaders_VERSION "${tmpvar}")
 endif()
 if("${KernelHeaders_VERSION}" EQUAL "")
     string(REGEX MATCH "[0-9]+\\.[0-9]+\\.[0-9]+" KernelHeaders_VERSION ${KernelHeaders_INCLUDE_DIR})
-- 
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