From aa18964dd64511305de0711fed912054da6f5d18 Mon Sep 17 00:00:00 2001
From: Triet Hoang <triet.hoang.dev@gmail.com>
Date: Tue, 18 Aug 2026 14:48:37 +0000
Subject: [PATCH] perf unwind: Handle allocation failure in
 libdw__get_entries()

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>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/util/unwind-libdw.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/util/unwind-libdw.c b/tools/perf/util/unwind-libdw.c
index 63a5c2253174..8d9fa6fd81c3 100644
--- a/tools/perf/util/unwind-libdw.c
+++ b/tools/perf/util/unwind-libdw.c
@@ -397,6 +397,11 @@ 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) {
+			free(ui);
+			return -ENOMEM;
+		}
+
 		dwfl = dwfl_begin(&offline_callbacks);
 		if (!dwfl)
 			goto out;