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| author | Ian Rogers <irogers@google.com> | 2024-02-10 06:17:43 +0300 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2024-02-12 23:35:33 +0300 |
| commit | 107ef66cb054f8d54e336236a31631a8cc167c1f (patch) | |
| tree | d3b67ab8a3a16e344c3b05d1023bd80a2fa144d0 /tools/perf/util/probe-event.c | |
| parent | 42fd623b58dbcc48310705bbf3e3d4d7c1deec29 (diff) | |
| download | linux-107ef66cb054f8d54e336236a31631a8cc167c1f.tar.xz | |
perf maps: Get map before returning in maps__find_by_name
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. Also fix some reference counted pointer comparisons.
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/20240210031746.4057262-4-irogers@google.com
Diffstat (limited to 'tools/perf/util/probe-event.c')
| -rw-r--r-- | tools/perf/util/probe-event.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index a1a796043691..be71abe8b9b0 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -358,6 +358,7 @@ static int kernel_get_module_dso(const char *module, struct dso **pdso) map = maps__find_by_name(machine__kernel_maps(host_machine), module_name); if (map) { dso = map__dso(map); + map__put(map); goto found; } pr_debug("Failed to find module %s.\n", module); |