linux-kernel - [tip: perf/core] perf/x86/intel/uncore: Fix reference count leak in hswep_has_limit

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Date:   Thu, 24 Nov 2022 12:02:48 -0000
From:   "tip-bot2 for Xiongfeng Wang" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Kan Liang <kan.liang@...ux.intel.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: perf/core] perf/x86/intel/uncore: Fix reference count leak in
 hswep_has_limit_sbox()

The following commit has been merged into the perf/core branch of tip:

Commit-ID:     1ff9dd6e7071a561f803135c1d684b13c7a7d01d
Gitweb:        https://git.kernel.org/tip/1ff9dd6e7071a561f803135c1d684b13c7a7d01d
Author:        Xiongfeng Wang <wangxiongfeng2@...wei.com>
AuthorDate:    Fri, 18 Nov 2022 14:31:35 +08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 24 Nov 2022 11:09:25 +01:00

perf/x86/intel/uncore: Fix reference count leak in hswep_has_limit_sbox()

pci_get_device() will increase the reference count for the returned
'dev'. We need to call pci_dev_put() to decrease the reference count.
Since 'dev' is only used in pci_read_config_dword(), let's add
pci_dev_put() right after it.

Fixes: 9d480158ee86 ("perf/x86/intel/uncore: Remove uncore extra PCI dev HSWEP_PCI_PCU_3")
Signed-off-by: Xiongfeng Wang <wangxiongfeng2@...wei.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Reviewed-by: Kan Liang <kan.liang@...ux.intel.com>
Link: https://lore.kernel.org/r/20221118063137.121512-3-wangxiongfeng2@huawei.com
---
 arch/x86/events/intel/uncore_snbep.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index b14d591..93b0f1f 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -2910,6 +2910,7 @@ static bool hswep_has_limit_sbox(unsigned int device)
 		return false;
 
 	pci_read_config_dword(dev, HSWEP_PCU_CAPID4_OFFET, &capid4);
+	pci_dev_put(dev);
 	if (!hswep_get_chop(capid4))
 		return true;