mib created this revision. mib added reviewers: teemperor, JDevlieghere. mib added a project: LLDB. Herald added a subscriber: lldb-commits.
This patch fixes a crash that is happening because of a null pointer dereference in SBFrame. StackFrame::GetRegisterContext says explicitly that you might not get a valid RegisterContext back but the pointer wasn't tested before, resulting in crashes. This should solve the issue. rdar://54462095 Signed-off-by: Med Ismail Bennani <medismail.benn...@gmail.com> Repository: rG LLVM Github Monorepo https://reviews.llvm.org/D83343 Files: lldb/source/API/SBFrame.cpp Index: lldb/source/API/SBFrame.cpp =================================================================== --- lldb/source/API/SBFrame.cpp +++ lldb/source/API/SBFrame.cpp @@ -361,9 +361,11 @@ Process::StopLocker stop_locker; if (stop_locker.TryLock(&process->GetRunLock())) { frame = exe_ctx.GetFramePtr(); - if (frame) { - ret_val = frame->GetRegisterContext()->SetPC(new_pc); - } + RegisterContextSP reg_ctx_sp = nullptr; + if (frame) + reg_ctx_sp = frame->GetRegisterContext(); + if (reg_ctx_sp) + ret_val = reg_ctx_sp->SetPC(new_pc); } } @@ -384,9 +386,11 @@ Process::StopLocker stop_locker; if (stop_locker.TryLock(&process->GetRunLock())) { frame = exe_ctx.GetFramePtr(); - if (frame) { - addr = frame->GetRegisterContext()->GetSP(); - } + RegisterContextSP reg_ctx_sp = nullptr; + if (frame) + reg_ctx_sp = frame->GetRegisterContext(); + if (reg_ctx_sp) + addr = reg_ctx_sp->GetSP(); } } @@ -407,8 +411,11 @@ Process::StopLocker stop_locker; if (stop_locker.TryLock(&process->GetRunLock())) { frame = exe_ctx.GetFramePtr(); + RegisterContextSP reg_ctx_sp = nullptr; if (frame) - addr = frame->GetRegisterContext()->GetFP(); + reg_ctx_sp = frame->GetRegisterContext(); + if (reg_ctx_sp) + addr = reg_ctx_sp->GetFP(); } }
Index: lldb/source/API/SBFrame.cpp =================================================================== --- lldb/source/API/SBFrame.cpp +++ lldb/source/API/SBFrame.cpp @@ -361,9 +361,11 @@ Process::StopLocker stop_locker; if (stop_locker.TryLock(&process->GetRunLock())) { frame = exe_ctx.GetFramePtr(); - if (frame) { - ret_val = frame->GetRegisterContext()->SetPC(new_pc); - } + RegisterContextSP reg_ctx_sp = nullptr; + if (frame) + reg_ctx_sp = frame->GetRegisterContext(); + if (reg_ctx_sp) + ret_val = reg_ctx_sp->SetPC(new_pc); } } @@ -384,9 +386,11 @@ Process::StopLocker stop_locker; if (stop_locker.TryLock(&process->GetRunLock())) { frame = exe_ctx.GetFramePtr(); - if (frame) { - addr = frame->GetRegisterContext()->GetSP(); - } + RegisterContextSP reg_ctx_sp = nullptr; + if (frame) + reg_ctx_sp = frame->GetRegisterContext(); + if (reg_ctx_sp) + addr = reg_ctx_sp->GetSP(); } } @@ -407,8 +411,11 @@ Process::StopLocker stop_locker; if (stop_locker.TryLock(&process->GetRunLock())) { frame = exe_ctx.GetFramePtr(); + RegisterContextSP reg_ctx_sp = nullptr; if (frame) - addr = frame->GetRegisterContext()->GetFP(); + reg_ctx_sp = frame->GetRegisterContext(); + if (reg_ctx_sp) + addr = reg_ctx_sp->GetFP(); } }
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