linux-kernel - [PATCH 1/2] coresight: trbe: Prevent overflow in PERF

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Message-Id: <20250917-fix_aux_trace_index-v1-1-e36a76ac6292@arm.com>
Date: Wed, 17 Sep 2025 18:41:38 +0100
From: Leo Yan <leo.yan@....com>
To: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>, 
 Suzuki K Poulose <suzuki.poulose@....com>, 
 Mike Leach <mike.leach@...aro.org>, James Clark <james.clark@...aro.org>, 
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>, 
 Anshuman Khandual <anshuman.khandual@....com>, 
 Tamas Zsoldos <tamas.zsoldos@....com>
Cc: coresight@...ts.linaro.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org, 
 Leo Yan <leo.yan@....com>
Subject: [PATCH 1/2] coresight: trbe: Prevent overflow in PERF_IDX2OFF()

Cast nr_pages to unsigned long to avoid overflow when handling large
AUX buffer sizes (>= 2 GiB).

Fixes: 3fbf7f011f24 ("coresight: sink: Add TRBE driver")
Signed-off-by: Leo Yan <leo.yan@....com>
---
 drivers/hwtracing/coresight/coresight-trbe.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/hwtracing/coresight/coresight-trbe.c b/drivers/hwtracing/coresight/coresight-trbe.c
index 8267dd1a2130d37d9507791620ea7bc8cbcd675c..8f426f94e32a15fd26e6c4e42385a5d93a7b7c1a 100644
--- a/drivers/hwtracing/coresight/coresight-trbe.c
+++ b/drivers/hwtracing/coresight/coresight-trbe.c
@@ -23,7 +23,8 @@
 #include "coresight-self-hosted-trace.h"
 #include "coresight-trbe.h"
 
-#define PERF_IDX2OFF(idx, buf) ((idx) % ((buf)->nr_pages << PAGE_SHIFT))
+#define PERF_IDX2OFF(idx, buf) \
+	((idx) % ((unsigned long)(buf)->nr_pages << PAGE_SHIFT))
 
 /*
  * A padding packet that will help the user space tools

-- 
2.34.1