From: Leo Yan <leo.yan@arm.com>
To: Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@linaro.org>,
James Clark <james.clark@linaro.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Mathieu Poirier <mathieu.poirier@linaro.org>,
Mao Jinlong <quic_jinlmao@quicinc.com>
Cc: coresight@lists.linaro.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Leo Yan <leo.yan@arm.com>
Subject: [PATCH v2 1/8] coresight: Fix memory leak in coresight_alloc_device_name()
Date: Mon, 26 Jan 2026 13:52:01 +0000 [thread overview]
Message-ID: <20260126-arm_coresight_refactor_dev_register-v2-1-b5a3c0441c15@arm.com> (raw)
In-Reply-To: <20260126-arm_coresight_refactor_dev_register-v2-0-b5a3c0441c15@arm.com>
The memory leak detector reports:
echo clear > /sys/kernel/debug/kmemleak
modprobe coresight_funnel
rmmod coresight_funnel
# Scan memory leak and report it
echo scan > /sys/kernel/debug/kmemleak
cat /sys/kernel/debug/kmemleak
unreferenced object 0xffff0008020c7200 (size 64):
comm "modprobe", pid 410, jiffies 4295333721
hex dump (first 32 bytes):
d8 da fe 7e 09 00 ff ff e8 2e ff 7e 09 00 ff ff ...~.......~....
b0 6c ff 7e 09 00 ff ff 30 83 00 7f 09 00 ff ff .l.~....0.......
backtrace (crc 4116a690):
kmemleak_alloc+0xd8/0xf8
__kmalloc_node_track_caller_noprof+0x2c8/0x6f0
krealloc_node_align_noprof+0x13c/0x2c8
coresight_alloc_device_name+0xe4/0x158 [coresight]
0xffffd327ecef8394
0xffffd327ecef85ec
amba_probe+0x118/0x1c8
really_probe+0xc8/0x3f0
__driver_probe_device+0x88/0x190
driver_probe_device+0x44/0x120
__driver_attach+0x100/0x238
bus_for_each_dev+0x84/0xf0
driver_attach+0x2c/0x40
bus_add_driver+0x128/0x258
driver_register+0x64/0x138
__amba_driver_register+0x2c/0x48
Change to use devm_krealloc_array() for allocation fwnode_list so that
the device model can automatically release the memory when the module
is unloaded.
Fixes: 0f5f9b6ba9e1 ("coresight: Use platform agnostic names")
Signed-off-by: Leo Yan <leo.yan@arm.com>
---
drivers/hwtracing/coresight/coresight-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight-core.c b/drivers/hwtracing/coresight/coresight-core.c
index c660cf8adb1c7cafff8f85e501f056e4e151e372..ed304f292b7b02e89c59053d43f88fbf663cc993 100644
--- a/drivers/hwtracing/coresight/coresight-core.c
+++ b/drivers/hwtracing/coresight/coresight-core.c
@@ -1546,7 +1546,7 @@ char *coresight_alloc_device_name(struct coresight_dev_list *dict,
if (idx < 0) {
/* Make space for the new entry */
idx = dict->nr_idx;
- list = krealloc_array(dict->fwnode_list,
+ list = devm_krealloc_array(dev, dict->fwnode_list,
idx + 1, sizeof(*dict->fwnode_list),
GFP_KERNEL);
if (ZERO_OR_NULL_PTR(list)) {
--
2.34.1
next prev parent reply other threads:[~2026-01-26 13:52 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-26 13:52 [PATCH v2 0/8] coresight: Fix device registration and unregistration Leo Yan
2026-01-26 13:52 ` Leo Yan [this message]
2026-01-26 15:48 ` [PATCH v2 1/8] coresight: Fix memory leak in coresight_alloc_device_name() Suzuki K Poulose
2026-01-26 16:18 ` Leo Yan
2026-01-26 13:52 ` [PATCH v2 2/8] coresight: Get parent device reference after sink ID map allocation Leo Yan
2026-01-26 13:52 ` [PATCH v2 3/8] coresight: Protect unregistration with mutex Leo Yan
2026-01-26 13:52 ` [PATCH v2 4/8] coresight: Refactor output connection sysfs link cleanup Leo Yan
2026-01-26 13:52 ` [PATCH v2 5/8] coresight: Refactor sysfs connection group cleanup Leo Yan
2026-01-26 13:52 ` [PATCH v2 6/8] coresight: Move sink validation into etm_perf_add_symlink_sink() Leo Yan
2026-01-26 13:52 ` [PATCH v2 7/8] coresight: Do not mix success path with failure handling Leo Yan
2026-01-26 13:52 ` [PATCH v2 8/8] coresight: Unify error handling in coresight_register() Leo Yan
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