* [PATCH] perf unwind: handle allocation failure in libdw__get_entries()
@ 2026-08-18 14:24 Triet Hoang
0 siblings, 0 replies; only message in thread
From: Triet Hoang @ 2026-08-18 14:24 UTC (permalink / raw)
To: linux-perf-users
Cc: peterz, mingo, acme, namhyung, mark.rutland, alexander.shishkin,
jolsa, irogers, adrian.hunter, james.clark, linux-kernel,
Triet Hoang
Check the return value of zalloc() before dereferencing the allocated
dwfl_ui_ti structure.
Return -ENOMEM when the allocation fails to avoid a NULL pointer
dereference.
Signed-off-by: Triet Hoang <triet.hoang.dev@gmail.com>
---
tools/perf/util/unwind-libdw.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index 7f35042be567..ff36552ca175 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -379,6 +379,9 @@ int libdw__get_entries(unwind_entry_cb_t cb, void *arg,
dwfl = dwfl_ui_ti->dwfl;
} else {
dwfl_ui_ti = zalloc(sizeof(*dwfl_ui_ti));
+ if (!dwfl_ui_ti)
+ return -ENOMEM;
+
dwfl = dwfl_begin(&offline_callbacks);
if (!dwfl)
goto out;
--
2.53.0
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