Bug Summary

File:tools/lldb/source/Utility/Environment.cpp
Warning:line 34, column 13
Dereference of null pointer

Annotated Source Code

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clang -cc1 -triple x86_64-pc-linux-gnu -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name Environment.cpp -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-eagerly-assume -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=cplusplus -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -mrelocation-model pic -pic-level 2 -mthread-model posix -fmath-errno -masm-verbose -mconstructor-aliases -munwind-tables -fuse-init-array -target-cpu x86-64 -dwarf-column-info -debugger-tuning=gdb -momit-leaf-frame-pointer -ffunction-sections -fdata-sections -resource-dir /usr/lib/llvm-7/lib/clang/7.0.0 -D HAVE_ROUND -D LLDB_CONFIGURATION_RELEASE -D LLDB_USE_BUILTIN_DEMANGLER -D _DEBUG -D _GNU_SOURCE -D __STDC_CONSTANT_MACROS -D __STDC_FORMAT_MACROS -D __STDC_LIMIT_MACROS -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/lldb/source/Utility -I /build/llvm-toolchain-snapshot-7~svn325118/tools/lldb/source/Utility -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/lldb/include -I /build/llvm-toolchain-snapshot-7~svn325118/tools/lldb/include -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/include -I /build/llvm-toolchain-snapshot-7~svn325118/include -I /usr/include/python2.7 -I /build/llvm-toolchain-snapshot-7~svn325118/tools/clang/include -I /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/lldb/../clang/include -I /build/llvm-toolchain-snapshot-7~svn325118/tools/lldb/source/. -U NDEBUG -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/x86_64-linux-gnu/c++/7.3.0 -internal-isystem /usr/lib/gcc/x86_64-linux-gnu/7.3.0/../../../../include/c++/7.3.0/backward -internal-isystem /usr/include/clang/7.0.0/include/ -internal-isystem /usr/local/include -internal-isystem /usr/lib/llvm-7/lib/clang/7.0.0/include -internal-externc-isystem /usr/include/x86_64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem /usr/include -O2 -Wno-unused-parameter -Wwrite-strings -Wno-missing-field-initializers -Wno-long-long -Wno-maybe-uninitialized -Wno-comment -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-strict-aliasing -Wno-deprecated-register -Wno-vla-extension -std=c++11 -fdeprecated-macro -fdebug-compilation-dir /build/llvm-toolchain-snapshot-7~svn325118/build-llvm/tools/lldb/source/Utility -ferror-limit 19 -fmessage-length 0 -fvisibility-inlines-hidden -fobjc-runtime=gcc -fdiagnostics-show-option -vectorize-loops -vectorize-slp -analyzer-checker optin.performance.Padding -analyzer-output=html -analyzer-config stable-report-filename=true -o /tmp/scan-build-2018-02-14-150435-17243-1 -x c++ /build/llvm-toolchain-snapshot-7~svn325118/tools/lldb/source/Utility/Environment.cpp
1//===-- Environment.cpp -----------------------------------------*- C++ -*-===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "lldb/Utility/Environment.h"
11
12using namespace lldb_private;
13
14char *Environment::Envp::make_entry(llvm::StringRef Key,
15 llvm::StringRef Value) {
16 const size_t size = Key.size() + 1 /*=*/ + Value.size() + 1 /*\0*/;
17 char *Result = reinterpret_cast<char *>(
18 Allocator.Allocate(sizeof(char) * size, alignof(char)));
19 char *Next = Result;
20
21 Next = std::copy(Key.begin(), Key.end(), Next);
22 *Next++ = '=';
23 Next = std::copy(Value.begin(), Value.end(), Next);
24 *Next++ = '\0';
25
26 return Result;
27}
28
29Environment::Envp::Envp(const Environment &Env) {
30 Data = reinterpret_cast<char **>(
31 Allocator.Allocate(sizeof(char *) * (Env.size() + 1), alignof(char *)));
32 char **Next = Data;
33 for (const auto &KV : Env)
34 *Next++ = make_entry(KV.first(), KV.second);
1
Null pointer value stored to 'Next'
2
Dereference of null pointer
35 *Next++ = nullptr;
36}
37
38Environment::Environment(const char *const *Env) {
39 if (!Env)
40 return;
41 while (*Env)
42 insert(*Env++);
43}
44
45void Environment::insert(const_iterator first, const_iterator last) {
46 while (first != last) {
47 try_emplace(first->first(), first->second);
48 ++first;
49 }
50}