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Message-ID: <CAP-5=fXr6Nc9qkaN+yHJRDNsg6nMxJiV9p7o9OR5cByeey-w0w@mail.gmail.com>
Date: Tue, 18 Apr 2023 08:55:04 -0700
From: Ian Rogers <irogers@...gle.com>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: James Clark <james.clark@....com>,
linux-perf-users@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Suzuki K Poulose <suzuki.poulose@....com>,
Mike Leach <mike.leach@...aro.org>,
Leo Yan <leo.yan@...aro.org>,
John Garry <john.g.garry@...cle.com>,
Will Deacon <will@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Mark Rutland <mark.rutland@....com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Jiri Olsa <jolsa@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Adrian Hunter <adrian.hunter@...el.com>,
coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] perf tools: Fix use before NULL check introduced by
map__dso() introduction
On Tue, Apr 18, 2023 at 8:50 AM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> James Clark noticed that the recent 63df0e4bc368adbd ("perf map: Add
> accessor for dso") patch accessed map->dso before the 'map' variable was
> NULL checked, which is a change in logic that leads to segmentation
> faults, so comb thru that patch to fix similar cases.
>
> Fixes: 63df0e4bc368adbd ("perf map: Add accessor for dso")
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: John Garry <john.g.garry@...cle.com>
> Cc: Leo Yan <leo.yan@...aro.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Mike Leach <mike.leach@...aro.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Will Deacon <will@...nel.org>
> To: James Clark <james.clark@....com>
> Link: https://lore.kernel.org/lkml/
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Sorry for the breakage!
Acked-by: Ian Rogers <irogers@...gle.com>
Thanks,
Ian
> ---
> tools/perf/builtin-script.c | 7 +++----
> tools/perf/ui/browsers/hists.c | 4 ++--
> tools/perf/util/sort.c | 2 +-
> 3 files changed, 6 insertions(+), 7 deletions(-)
>
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 8fba247b798ca307..006f522d0e7f6a18 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -1075,8 +1075,7 @@ static int grab_bb(u8 *buffer, u64 start, u64 end,
> return 0;
> }
>
> - dso = map__dso(al.map);
> - if (!thread__find_map(thread, *cpumode, start, &al) || !dso) {
> + if (!thread__find_map(thread, *cpumode, start, &al) || (dso = map__dso(al.map)) == NULL) {
> pr_debug("\tcannot resolve %" PRIx64 "-%" PRIx64 "\n", start, end);
> return 0;
> }
> @@ -1106,9 +1105,9 @@ static int map__fprintf_srccode(struct map *map, u64 addr, FILE *fp, struct srcc
> unsigned line;
> int len;
> char *srccode;
> - struct dso *dso = map__dso(map);
> + struct dso *dso;
>
> - if (!map || !dso)
> + if (!map || (dso = map__dso(map)) == NULL)
> return 0;
> srcfile = get_srcline_split(dso,
> map__rip_2objdump(map, addr),
> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index ab70e5f5fad236e5..69c81759a64f938f 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -2499,9 +2499,9 @@ add_annotate_opt(struct hist_browser *browser __maybe_unused,
> struct map_symbol *ms,
> u64 addr)
> {
> - struct dso *dso = map__dso(ms->map);
> + struct dso *dso;
>
> - if (!ms->map || !dso || dso->annotate_warned)
> + if (!ms->map || (dso = map__dso(ms->map)) == NULL || dso->annotate_warned)
> return 0;
>
> if (!ms->sym)
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index f2ffaf90648e469e..31b1cd0935e277ba 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -1568,7 +1568,7 @@ static int hist_entry__dcacheline_snprintf(struct hist_entry *he, char *bf,
>
> if (he->mem_info) {
> struct map *map = he->mem_info->daddr.ms.map;
> - struct dso *dso = map__dso(map);
> + struct dso *dso = map ? map__dso(map) : NULL;
>
> addr = cl_address(he->mem_info->daddr.al_addr, chk_double_cl);
> ms = &he->mem_info->daddr.ms;
> --
> 2.39.2
>
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