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

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Date:   Thu, 24 Nov 2022 12:02:46 -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
 snr_uncore_mmio_map()

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

Commit-ID:     8ebd16c11c346751b3944d708e6c181ed4746c39
Gitweb:        https://git.kernel.org/tip/8ebd16c11c346751b3944d708e6c181ed4746c39
Author:        Xiongfeng Wang <wangxiongfeng2@...wei.com>
AuthorDate:    Fri, 18 Nov 2022 14:31:36 +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 snr_uncore_mmio_map()

pci_get_device() will increase the reference count for the returned
pci_dev, so snr_uncore_get_mc_dev() will return a pci_dev with its
reference count increased. We need to call pci_dev_put() to decrease the
reference count. Let's add the missing pci_dev_put().

Fixes: ee49532b38dd ("perf/x86/intel/uncore: Add IMC uncore support for Snow Ridge")
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/20221118063137.121512-4-wangxiongfeng2@huawei.com
---
 arch/x86/events/intel/uncore_snbep.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c
index 93b0f1f..44c2f87 100644
--- a/arch/x86/events/intel/uncore_snbep.c
+++ b/arch/x86/events/intel/uncore_snbep.c
@@ -5111,6 +5111,8 @@ static int snr_uncore_mmio_map(struct intel_uncore_box *box,
 
 	addr += box_ctl;
 
+	pci_dev_put(pdev);
+
 	box->io_addr = ioremap(addr, type->mmio_map_size);
 	if (!box->io_addr) {
 		pr_warn("perf uncore: Failed to ioremap for %s.\n", type->name);