diff options
| author | Ian Rogers <irogers@google.com> | 2024-10-16 16:56:22 -0700 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2024-10-17 12:43:14 -0700 |
| commit | 4585038b8e186252141ef86e9f0d8e97f11dce8d (patch) | |
| tree | bd12450c4a07e05ed94a3c68d3fd7c6773284f42 | |
| parent | 1280f012e06e1555de47e3c3a9be898d8cbda5fb (diff) | |
perf probe: Fix libdw memory leak
Add missing dwarf_cfi_end to free memory associated with probe_finder
cfi_eh which is allocated and owned via a call to
dwarf_getcfi_elf. Confusingly cfi_dbg shouldn't be freed as its memory
is owned by the passed in debuginfo struct. Add comments to highlight
this.
This addresses leak sanitizer issues seen in:
tools/perf/tests/shell/test_uprobe_from_different_cu.sh
Fixes: 270bde1e76f4 ("perf probe: Search both .eh_frame and .debug_frame sections for probe location")
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Steinar H. Gunderson <sesse@google.com>
Cc: Alexander Lobakin <aleksander.lobakin@intel.com>
Cc: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
Link: https://lore.kernel.org/r/20241016235622.52166-3-irogers@google.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
| -rw-r--r-- | tools/perf/util/probe-finder.c | 4 | ||||
| -rw-r--r-- | tools/perf/util/probe-finder.h | 4 |
2 files changed, 6 insertions, 2 deletions
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index 630e16c54ed5..d6b902899940 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -1379,6 +1379,10 @@ int debuginfo__find_trace_events(struct debuginfo *dbg, if (ret >= 0 && tf.pf.skip_empty_arg) ret = fill_empty_trace_arg(pev, tf.tevs, tf.ntevs); +#if _ELFUTILS_PREREQ(0, 142) + dwarf_cfi_end(tf.pf.cfi_eh); +#endif + if (ret < 0 || tf.ntevs == 0) { for (i = 0; i < tf.ntevs; i++) clear_probe_trace_event(&tf.tevs[i]); diff --git a/tools/perf/util/probe-finder.h b/tools/perf/util/probe-finder.h index 3add5ff516e1..724db829b49e 100644 --- a/tools/perf/util/probe-finder.h +++ b/tools/perf/util/probe-finder.h @@ -64,9 +64,9 @@ struct probe_finder { /* For variable searching */ #if _ELFUTILS_PREREQ(0, 142) - /* Call Frame Information from .eh_frame */ + /* Call Frame Information from .eh_frame. Owned by this struct. */ Dwarf_CFI *cfi_eh; - /* Call Frame Information from .debug_frame */ + /* Call Frame Information from .debug_frame. Not owned. */ Dwarf_CFI *cfi_dbg; #endif Dwarf_Op *fb_ops; /* Frame base attribute */ |