[PATCH v4 3/9] perf disasm: Fix potential NULL pointer dereference in arch__find()

[Ian Rogers <irogers@google.com>]

If arch_new_fn[e_machine]() fails (e.g., returning NULL to reject an
architecture or upon allocation failure), the error path attempts to
print result->name, dereferencing a NULL pointer and leading to a
segmentation fault. Fix it by printing the numeric e_machine value
instead.

Reported-by: sashiko-bot <sashiko-bot@kernel.org>
Closes: https://lore.kernel.org/linux-perf-users/20260709035721.9EE901F000E9@smtp.kernel.org/
Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/util/disasm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/disasm.c b/tools/perf/util/disasm.c
index 0a1a7e9cf3ef..5b114f089d56 100644
--- a/tools/perf/util/disasm.c
+++ b/tools/perf/util/disasm.c
@@ -182,8 +182,8 @@ const struct arch *arch__find(uint16_t e_machine, uint32_t e_flags, const char *
 
 	result = arch_new_fn[e_machine](&key, cpuid);
 	if (!result) {
-		pr_err("%s: failed to initialize %s (%u) arch priv area\n",
-			__func__, result->name, e_machine);
+		pr_err("%s: failed to initialize %u arch priv area\n",
+			__func__, e_machine);
 		free(tmp);
 		return NULL;
 	}
-- 
2.55.0.795.g602f6c329a-goog