https://github.com/necto created https://github.com/llvm/llvm-project/pull/106568
As reported in https://github.com/llvm/llvm-project/pull/105648#issuecomment-2317144635 commit 08ad8dc7154bf3ab79f750e6d5fb7df597c7601a introduced a nullptr dereference in the case when store contains a binding to a symbol that has no origin region associated with it, such as the symbol generated when a pointer is passed to an opaque function. >From 71aae8d0cc96d389da95c2231b1145b7ffeb2132 Mon Sep 17 00:00:00 2001 From: Arseniy Zaostrovnykh <necto...@gmail.com> Date: Thu, 29 Aug 2024 16:39:12 +0200 Subject: [PATCH] [analyzer] Fix nullptr dereference for symbols from pointer invalidation As reported in https://github.com/llvm/llvm-project/pull/105648#issuecomment-2317144635 commit 08ad8dc7154bf3ab79f750e6d5fb7df597c7601a introduced a nullptr dereference in the case when store contains a binding to a symbol that has no origin region associated with it, such as the symbol generated when a pointer is passed to an opaque function. --- .../Checkers/StackAddrEscapeChecker.cpp | 5 ++++- clang/test/Analysis/stack-addr-ps.c | 19 +++++++++++++++++++ 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/clang/lib/StaticAnalyzer/Checkers/StackAddrEscapeChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/StackAddrEscapeChecker.cpp index 20232405d572d2..d3b185541729d3 100644 --- a/clang/lib/StaticAnalyzer/Checkers/StackAddrEscapeChecker.cpp +++ b/clang/lib/StaticAnalyzer/Checkers/StackAddrEscapeChecker.cpp @@ -308,7 +308,10 @@ static const MemSpaceRegion *getStackOrGlobalSpaceRegion(const MemRegion *R) { const MemRegion *getOriginBaseRegion(const MemRegion *Reg) { Reg = Reg->getBaseRegion(); while (const auto *SymReg = dyn_cast<SymbolicRegion>(Reg)) { - Reg = SymReg->getSymbol()->getOriginRegion()->getBaseRegion(); + const auto* OriginReg = SymReg->getSymbol()->getOriginRegion(); + if (!OriginReg) + break; + Reg = OriginReg->getBaseRegion(); } return Reg; } diff --git a/clang/test/Analysis/stack-addr-ps.c b/clang/test/Analysis/stack-addr-ps.c index 138b8c16b02bde..f47529623a6f57 100644 --- a/clang/test/Analysis/stack-addr-ps.c +++ b/clang/test/Analysis/stack-addr-ps.c @@ -126,3 +126,22 @@ void caller_for_nested_leaking() { int *ptr = 0; caller_mid_for_nested_leaking(&ptr); } + +// This used to crash StackAddrEscapeChecker because +// it features a symbol conj_$1{struct c *, LC1, S763, #1} +// that has no origin region. +// bbi-98571 +struct a { + int member; +}; + +struct c { + struct a *nested_ptr; +}; +long global_var; +void opaque(struct c*); +void bbi_98571_no_crash() { + struct c *ptr = (struct c *)global_var; + opaque(ptr); + ptr->nested_ptr->member++; +} _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
