diff --git a/fastboot/device/utility.cpp b/fastboot/device/utility.cpp
index 528abec..30c5960 100644
--- a/fastboot/device/utility.cpp
+++ b/fastboot/device/utility.cpp
@@ -23,6 +23,7 @@
 
 #include <android-base/file.h>
 #include <android-base/logging.h>
+#include <android-base/strings.h>
 #include <fs_mgr.h>
 #include <fs_mgr_dm_linear.h>
 #include <liblp/liblp.h>
@@ -82,6 +83,10 @@
 }
 
 std::optional<std::string> FindPhysicalPartition(const std::string& name) {
+    // Check for an invalid file name
+    if (android::base::StartsWith(name, "../") || name.find("/../") != std::string::npos) {
+        return {};
+    }
     std::string path = "/dev/block/by-name/" + name;
     if (access(path.c_str(), W_OK) < 0) {
         return {};