From 52c8542336028d78938a712b6d337d0f45397dd5 Mon Sep 17 00:00:00 2001 From: Uri Tauber <142022451+Uri-Tauber@users.noreply.github.com> Date: Wed, 18 Feb 2026 12:55:23 +0200 Subject: [PATCH] fix: Fix a dangling pointer (#939) ## Summary * **What is the goal of this PR?** Fix a dangling pointer issue caused by using `.c_str()` on a temporary `std::string`. `basepath.substr()` creates a temporary `std::string`, and calling `.c_str()` on it returns a pointer to its internal buffer (not a copy). Since the temporary string is destroyed at the end of the full expression, `folderName` ends up holding a dangling pointer, leading to undefined behavior. To solve this, we stores the result in a persistent `std::string` object, ensuring the underlying buffer remains valid for the duration of its use. A similar pattern caused the behavior reported in https://github.com/crosspoint-reader/crosspoint-reader/pull/728#issuecomment-3902529697 --- ### AI Usage While CrossPoint doesn't have restrictions on AI tools in contributing, please be transparent about their usage as it helps set the right context for reviewers. Did you use AI tools to help write this code? _**< NO >**_ --- src/activities/home/MyLibraryActivity.cpp | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/activities/home/MyLibraryActivity.cpp b/src/activities/home/MyLibraryActivity.cpp index c011198e..f224277e 100644 --- a/src/activities/home/MyLibraryActivity.cpp +++ b/src/activities/home/MyLibraryActivity.cpp @@ -196,8 +196,8 @@ void MyLibraryActivity::render(Activity::RenderLock&&) { const auto pageHeight = renderer.getScreenHeight(); auto metrics = UITheme::getInstance().getMetrics(); - auto folderName = basepath == "/" ? tr(STR_SD_CARD) : basepath.substr(basepath.rfind('/') + 1).c_str(); - GUI.drawHeader(renderer, Rect{0, metrics.topPadding, pageWidth, metrics.headerHeight}, folderName); + std::string folderName = (basepath == "/") ? tr(STR_SD_CARD) : basepath.substr(basepath.rfind('/') + 1); + GUI.drawHeader(renderer, Rect{0, metrics.topPadding, pageWidth, metrics.headerHeight}, folderName.c_str()); const int contentTop = metrics.topPadding + metrics.headerHeight + metrics.verticalSpacing; const int contentHeight = pageHeight - contentTop - metrics.buttonHintsHeight - metrics.verticalSpacing;