From: Ian Rogers irogers@google.com

mainline inclusion from mainline-v5.16-rc2 commit 0ca1f534a776cc7d42f2c33da4732b74ec2790cd category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I9S273 CVE: CVE-2021-47545

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?i...

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perf_hpp__column_unregister() removes an entry from a list but doesn't free the memory causing a memory leak spotted by leak sanitizer.

Add the free while at the same time reducing the scope of the function to static.

Signed-off-by: Ian Rogers irogers@google.com Reviewed-by: Kajol Jain kjain@linux.ibm.com Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Jiri Olsa jolsa@redhat.com Cc: Mark Rutland mark.rutland@arm.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Stephane Eranian eranian@google.com Link: http://lore.kernel.org/lkml/20211118071247.2140392-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Luo Gengkun luogengkun2@huawei.com --- tools/perf/ui/hist.c | 28 ++++++++++++++-------------- tools/perf/util/hist.h | 1 - 2 files changed, 14 insertions(+), 15 deletions(-)

diff --git a/tools/perf/ui/hist.c b/tools/perf/ui/hist.c index fe3dfaa64a91..4afb63cea41b 100644 --- a/tools/perf/ui/hist.c +++ b/tools/perf/ui/hist.c @@ -468,6 +468,18 @@ struct perf_hpp_list perf_hpp_list = { #undef __HPP_SORT_ACC_FN #undef __HPP_SORT_RAW_FN

+static void fmt_free(struct perf_hpp_fmt *fmt) +{ + /* + * At this point fmt should be completely + * unhooked, if not it's a bug. + */ + BUG_ON(!list_empty(&fmt->list)); + BUG_ON(!list_empty(&fmt->sort_list)); + + if (fmt->free) + fmt->free(fmt); +}

void perf_hpp__init(void) { @@ -531,9 +543,10 @@ void perf_hpp_list__prepend_sort_field(struct perf_hpp_list *list, list_add(&format->sort_list, &list->sorts); }

-void perf_hpp__column_unregister(struct perf_hpp_fmt *format) +static void perf_hpp__column_unregister(struct perf_hpp_fmt *format) { list_del_init(&format->list); + fmt_free(format); }

void perf_hpp__cancel_cumulate(void) @@ -605,19 +618,6 @@ void perf_hpp__append_sort_keys(struct perf_hpp_list *list) }

-static void fmt_free(struct perf_hpp_fmt *fmt) -{ - /* - * At this point fmt should be completely - * unhooked, if not it's a bug. - */ - BUG_ON(!list_empty(&fmt->list)); - BUG_ON(!list_empty(&fmt->sort_list)); - - if (fmt->free) - fmt->free(fmt); -} - void perf_hpp__reset_output_field(struct perf_hpp_list *list) { struct perf_hpp_fmt *fmt, *tmp; diff --git a/tools/perf/util/hist.h b/tools/perf/util/hist.h index 3badd7f1e1b8..f824ccf5b988 100644 --- a/tools/perf/util/hist.h +++ b/tools/perf/util/hist.h @@ -346,7 +346,6 @@ enum { };

void perf_hpp__init(void); -void perf_hpp__column_unregister(struct perf_hpp_fmt *format); void perf_hpp__cancel_cumulate(void); void perf_hpp__setup_output_field(struct perf_hpp_list *list); void perf_hpp__reset_output_field(struct perf_hpp_list *list);