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perf kwork: Use zfree() to avoid possibly accessing dangling pointers

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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>
This commit is contained in:
Arnaldo Carvalho de Melo 2024-05-07 00:04:06 -03:00
parent 54ef362e4d
commit 07fde75306
1 changed files with 1 additions and 1 deletions
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2
tools/perf/builtin-kwork.c
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@ -2230,7 +2230,7 @@ static int perf_kwork__top(struct perf_kwork *kwork)
perf_kwork__top_report(kwork);
out:
free(kwork->top_stat.cpus_runtime);
zfree(&kwork->top_stat.cpus_runtime);
return ret;
}