perf kwork: Use zfree() to avoid possibly accessing dangling pointers
authorArnaldo Carvalho de Melo <acme@redhat.com>
Tue, 7 May 2024 03:04:06 +0000 (00:04 -0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Tue, 7 May 2024 15:44:02 +0000 (12:44 -0300)
commit07fde75306667f60b5cee6f10c4115efbc719b96
tree56691656527f3e75bf314fd3e25296b783551125
parent54ef362e4daa4a4ecfa2abdc251b21564d27784e
perf kwork: Use zfree() to avoid possibly accessing dangling pointers

When freeing a->b it is good practice to set a->b to NULL using
zfree(&a->b) so that when we have a bug where a reference to a freed 'a'
pointer is kept somewhere, we can more quickly cause a segfault if some
code tries to use a->b.

Convert one such case in the 'perf kwork' codebase.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Yang Jihong <yangjihong1@huawei.com>
Link: https://lore.kernel.org/lkml/Zjmc5EiN6zmWZj4r@x1
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/builtin-kwork.c