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| author |  Ian Rogers <irogers@google.com>
| 2024-02-09 19:17:42 -0800 |
|---|---|---|
| committer |  Namhyung Kim <namhyung@kernel.org>
| 2024-02-12 12:35:26 -0800 |
| commit | 42fd623b58dbcc48310705bbf3e3d4d7c1deec29 (patch) | |
| tree | c83e8fd2ea1911d949137e0d51979a3d4675195d /tools/perf/util/symbol.c | |
| parent | perf maps: Switch from rbtree to lazily sorted array for addresses (diff) | |
| download | linux-42fd623b58dbcc48310705bbf3e3d4d7c1deec29.tar.gz linux-42fd623b58dbcc48310705bbf3e3d4d7c1deec29.tar.bz2 linux-42fd623b58dbcc48310705bbf3e3d4d7c1deec29.zip | |
perf maps: Get map before returning in maps__find
Finding a map is done under a lock, returning the map without a
reference count means it can be removed without notice and causing
uses after free. Grab a reference count to the map within the lock
region and return this. Fix up locations that need a map__put
following this.
Signed-off-by: Ian Rogers <irogers@google.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Cc: James Clark <james.clark@arm.com>
Cc: Vincent Whitchurch <vincent.whitchurch@axis.com>
Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Colin Ian King <colin.i.king@gmail.com>
Cc: Changbin Du <changbin.du@huawei.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Song Liu <song@kernel.org>
Cc: Leo Yan <leo.yan@linux.dev>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Artem Savkov <asavkov@redhat.com>
Cc: bpf@vger.kernel.org
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20240210031746.4057262-3-irogers@google.com
Diffstat (limited to 'tools/perf/util/symbol.c')
| -rw-r--r-- | tools/perf/util/symbol.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c index be212ba157dc..1710b89e207c 100644 --- a/tools/perf/util/symbol.c +++ b/tools/perf/util/symbol.c @@ -757,7 +757,6 @@ static int dso__load_all_kallsyms(struct dso *dso, const char *filename) static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso) { - struct map *curr_map; struct symbol *pos; int count = 0; struct rb_root_cached old_root = dso->symbols; @@ -770,6 +769,7 @@ static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso) *root = RB_ROOT_CACHED; while (next) { + struct map *curr_map; struct dso *curr_map_dso; char *module; @@ -796,6 +796,7 @@ static int maps__split_kallsyms_for_kcore(struct maps *kmaps, struct dso *dso) pos->end -= map__start(curr_map) - map__pgoff(curr_map); symbols__insert(&curr_map_dso->symbols, pos); ++count; + map__put(curr_map); } /* Symbols have been adjusted */ |