Jim Apple has uploaded this change for review. (
http://gerrit.cloudera.org:8080/11195
Change subject: IMPALA-5031: Remove some undefined behavior of NULL pointers
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IMPALA-5031: Remove some undefined behavior of NULL pointers
This was found in ExprTest.LiteralExprs. The rules vioalted are:
1. "reference binding to null pointer of type 'long'". This violates
the standard's [dcl.ref]:
a null reference cannot exist in a well-defined program, because
the only way to create such a reference would be to bind it to the
"object" obtained by indirection through a null pointer, which
causes undefined behavior.
The interesting part of the backtrace is:
#1 RuntimeProfile::TimeSeriesCounter::ToThrift(TTimeSeriesCounter*)
util/runtime-profile.cc:1117:11
#2 RuntimeProfile::ToThrift(std::vector<TRuntimeProfileNode>*) const
util/runtime-profile.cc:905:21
#3 RuntimeProfile::ToThrift(TRuntimeProfileTree*) const
util/runtime-profile.cc:847:3
#4 QueryState::ReportExecStatusAux(bool, Status const&,
FragmentInstanceState*, bool) runtime/query-state.cc:281:21
#5 QueryState::ReportExecStatus(bool, Status const&,
FragmentInstanceState*) runtime/query-state.cc:250:3
#6 FragmentInstanceState::SendReport(bool, Status const&)
runtime/fragment-instance-state.cc:406:17
#7 FragmentInstanceState::Finalize(Status const&)
runtime/fragment-instance-state.cc:496:3
2. The use of a null pointer when calling memcpy. According to "7.1.4
Use of library functions" in the C99 standard (which is included in
C++14 in section [intro.refs]:
If an argument to a function has an invalid value (such as a value
outside the domain of the function, or a pointer outside the
address space of the program, or a null pointer, or a pointer to
non-modifiable storage when the corresponding parameter is not
const-qualified) or a type (after promotion) not expected by a
function with variable number of arguments, the behavior is
undefined.
The interesting part of the backtrace is the same as above.
Change-Id: I3c8a6624918389396789a83b32dbf068b9327f76
---
M be/src/util/runtime-profile.cc
M be/src/util/ubsan.h
2 files changed, 9 insertions(+), 1 deletion(-)
git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/95/11195/1
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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: newchange
Gerrit-Change-Id: I3c8a6624918389396789a83b32dbf068b9327f76
Gerrit-Change-Number: 11195
Gerrit-PatchSet: 1
Gerrit-Owner: Jim Apple <[email protected]>
