[PATCH] D98504: [clang][Checkers] Fix state cleanup at dead symbol.
Balázs Kéri via Phabricator via cfe-commits
cfe-commits at lists.llvm.org
Fri Mar 12 07:10:31 PST 2021
balazske created this revision.
Herald added subscribers: martong, gamesh411, Szelethus, dkrupp.
Herald added a reviewer: Szelethus.
balazske requested review of this revision.
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Herald added a subscriber: cfe-commits.
It is possible that an entry in 'DestroyRetVal' lives longer
than an entry in 'LockMap' if not removed at checkDeadSymbols.
The added test case demonstrates this.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D98504
Files:
clang/lib/StaticAnalyzer/Checkers/PthreadLockChecker.cpp
clang/test/Analysis/pthreadlock.c
Index: clang/test/Analysis/pthreadlock.c
===================================================================
--- clang/test/Analysis/pthreadlock.c
+++ clang/test/Analysis/pthreadlock.c
@@ -513,3 +513,9 @@
fake_system_function();
pthread_mutex_lock(pmtx); // expected-warning{{This lock has already been acquired}}
}
+
+void nocrash1(pthread_mutex_t *mutex) {
+ int ret = pthread_mutex_destroy(mutex);
+ if (ret == 0) // no crash
+ ;
+}
Index: clang/lib/StaticAnalyzer/Checkers/PthreadLockChecker.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/PthreadLockChecker.cpp
+++ clang/lib/StaticAnalyzer/Checkers/PthreadLockChecker.cpp
@@ -646,8 +646,10 @@
for (auto I : State->get<LockMap>()) {
// Stop tracking dead mutex regions as well.
- if (!SymReaper.isLiveRegion(I.first))
+ if (!SymReaper.isLiveRegion(I.first)) {
State = State->remove<LockMap>(I.first);
+ State = State->remove<DestroyRetVal>(I.first);
+ }
}
// TODO: We probably need to clean up the lock stack as well.
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