This is a note to let you know that I've just added the patch titled perf/x86/intel/uncore: Fix reference count leak in hswep_has_limit_sbox() to the 4.19-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: perf-x86-intel-uncore-fix-reference-count-leak-in-hs.patch and it can be found in the queue-4.19 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit aa3b40c370c9cf4c1356acfe475cb3c345ed9a82 Author: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx> Date: Fri Nov 18 14:31:35 2022 +0800 perf/x86/intel/uncore: Fix reference count leak in hswep_has_limit_sbox() [ Upstream commit 1ff9dd6e7071a561f803135c1d684b13c7a7d01d ] 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@xxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Reviewed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20221118063137.121512-3-wangxiongfeng2@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/x86/events/intel/uncore_snbep.c b/arch/x86/events/intel/uncore_snbep.c index 2bf1170f7afd..34da6d27d839 100644 --- a/arch/x86/events/intel/uncore_snbep.c +++ b/arch/x86/events/intel/uncore_snbep.c @@ -2699,6 +2699,7 @@ 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;