0db344e517
The content of this branch was automatically imported from Fedora ELN with the following as its source: https://src.fedoraproject.org/rpms/clang#b4a94df45bf3126c8c50a71329b6704aa70bd697
48 lines
1.4 KiB
Diff
48 lines
1.4 KiB
Diff
From ad7211df6f257e39da2e5a11b2456b4488f32a1e Mon Sep 17 00:00:00 2001
|
|
From: Oliver Bruns <obruns@gmail.com>
|
|
Date: Mon, 6 Apr 2020 10:38:30 +0200
|
|
Subject: [PATCH] [clang] fix undefined behaviour in
|
|
RawComment::getFormattedText()
|
|
|
|
Summary:
|
|
Calling `back()` and `pop_back()` on the empty string is undefined
|
|
behavior [1,2].
|
|
|
|
The issue manifested itself as an uncaught `std::out_of_range` exception
|
|
when running `clangd` compiled on RHEL7 using devtoolset-9.
|
|
|
|
[1] https://en.cppreference.com/w/cpp/string/basic_string/back
|
|
[2] https://en.cppreference.com/w/cpp/string/basic_string/pop_back
|
|
|
|
Fixes: 1ff7c32fc91c607b690d4bb9cf42f406be8dde68
|
|
|
|
Reviewers: teemperor, ioeric, cfe-commits
|
|
|
|
Reviewed By: teemperor
|
|
|
|
Subscribers: ilya-biryukov, kadircet, usaxena95
|
|
|
|
Tags: #clang
|
|
|
|
Differential Revision: https://reviews.llvm.org/D77468
|
|
---
|
|
clang/lib/AST/RawCommentList.cpp | 2 +-
|
|
1 file changed, 1 insertion(+), 1 deletion(-)
|
|
|
|
diff --git a/clang/lib/AST/RawCommentList.cpp b/clang/lib/AST/RawCommentList.cpp
|
|
index 8552b4fcd2b..a8d15036cab 100644
|
|
--- a/clang/lib/AST/RawCommentList.cpp
|
|
+++ b/clang/lib/AST/RawCommentList.cpp
|
|
@@ -431,7 +431,7 @@ std::string RawComment::getFormattedText(const SourceManager &SourceMgr,
|
|
};
|
|
|
|
auto DropTrailingNewLines = [](std::string &Str) {
|
|
- while (Str.back() == '\n')
|
|
+ while (!Str.empty() && Str.back() == '\n')
|
|
Str.pop_back();
|
|
};
|
|
|
|
--
|
|
2.25.2
|
|
|