[PATCH v4 0/9] Improvements to memory usage by parse events

[Ian Rogers]

The parse events parser leaks memory for certain expressions as well
as allowing a char* to reference stack, heap or .rodata. This series
of patches improves the hygeine and adds free-ing operations to
reclaim memory in the parser in error and non-error situations.

The series of patches was generated with LLVM's address sanitizer and
libFuzzer:
https://llvm.org/docs/LibFuzzer.html
called on the parse_events function with randomly generated input. With
the patches no leaks or memory corruption issues were present.

The v4 patches address review comments from Jiri Olsa, turning a long
error message into a single warning, fixing the data type in a list
iterator and reordering patches.

The v3 patches address review comments from Jiri Olsa improving commit
messages, handling ENOMEM errors from strdup better, and removing a
printed warning if an invalid event is passed.

The v2 patches are preferable to an earlier proposed patch:
   perf tools: avoid reading out of scope array

Ian Rogers (9):
  perf tools: add parse events handle error
  perf tools: move ALLOC_LIST into a function
  perf tools: avoid a malloc for array events
  perf tools: splice events onto evlist even on error
  perf tools: ensure config and str in terms are unique
  perf tools: add destructors for parse event terms
  perf tools: before yyabort-ing free components
  perf tools: if pmu configuration fails free terms
  perf tools: add a deep delete for parse event terms

 tools/perf/util/parse-events.c | 177 ++++++++++-----
 tools/perf/util/parse-events.h |   3 +
 tools/perf/util/parse-events.y | 388 ++++++++++++++++++++++++---------
 tools/perf/util/pmu.c          |  32 +--
 4 files changed, 433 insertions(+), 167 deletions(-)

-- 
2.24.0.rc0.303.g954a862665-goog