dyld-360.18.tar.gz

diff --git a/src/dyld.cpp b/src/dyld.cpp
index 648b8873bd7a1e7588efaa769650fe16083fcaca..19166c515e22fa2129aca9b06a0d5f858b8c979d 100644 (file)
--- a/src/dyld.cpp
+++ b/src/dyld.cpp
@@ -1618,12 +1618,15 @@ static void checkLoadCommandEnvironmentVariables()
                                                if ( strncmp(&equals[-5], "_PATH", 5) == 0 ) {
                                                        const char* value = &equals[1];
                                                        const size_t keyLen = equals-keyEqualsValue;
-                                                       char key[keyLen+1];
-                                                       strncpy(key, keyEqualsValue, keyLen);
-                                                       key[keyLen] = '\0';
-                                                       //dyld::log("processing: %s\n", keyEqualsValue);
-                                                       //dyld::log("mainExecutableDir: %s\n", mainExecutableDir);
-                                                       processDyldEnvironmentVariable(key, value, mainExecutableDir);
+                                                       // <rdar://problem/22799635> don't let malformed load command overflow stack
+                                                       if ( keyLen < 40 ) {
+                                                               char key[keyLen+1];
+                                                               strncpy(key, keyEqualsValue, keyLen);
+                                                               key[keyLen] = '\0';
+                                                               //dyld::log("processing: %s\n", keyEqualsValue);
+                                                               //dyld::log("mainExecutableDir: %s\n", mainExecutableDir);
+                                                               processDyldEnvironmentVariable(key, value, mainExecutableDir);
+                                                       }
                                                }
                                        }
                                }