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perf map: Fix error return code in maps__clone()

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[ Upstream commit c6f8714125 ]

Although 'err' has been initialized to -ENOMEM, but it will be reassigned
by the "err = unwind__prepare_access(...)" statement in the for loop. So
that, the value of 'err' is unknown when map__clone() failed.

Fixes: 6c50258443 ("perf unwind: Call unwind__prepare_access for forked thread")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.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: zhen lei <thunder.leizhen@huawei.com>
Link: http://lore.kernel.org/lkml/20210415092744.3793-1-thunder.leizhen@huawei.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhen Lei
2021-04-15 17:27:44 +08:00
committed by Greg Kroah-Hartman
parent 4d0cfb3713
commit ffe249b4fc
1 changed files with 5 additions and 2 deletions
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7
tools/perf/util/map.c
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@@ -836,15 +836,18 @@ out:
int maps__clone(struct thread *thread, struct maps *parent)
{
struct maps *maps = thread->maps;
int err = -ENOMEM;
int err;
struct map *map;
down_read(&parent->lock);
maps__for_each_entry(parent, map) {
struct map *new = map__clone(map);
if (new == NULL)
if (new == NULL) {
err = -ENOMEM;
goto out_unlock;
}
err = unwind__prepare_access(maps, new, NULL);
if (err)