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 sad_cfg_iio_topology() to the 6.0-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-sa.patch and it can be found in the queue-6.0 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit ac3f9d977b1f36368d3d5d1993a9eb090d7a5b6f Author: Xiongfeng Wang <wangxiongfeng2@xxxxxxxxxx> Date: Fri Nov 18 14:31:34 2022 +0800 perf/x86/intel/uncore: Fix reference count leak in sad_cfg_iio_topology() [ Upstream commit c508eb042d9739bf9473526f53303721b70e9100 ] pci_get_device() will increase the reference count for the returned pci_dev, and also decrease the reference count for the input parameter *from* if it is not NULL. If we break the loop in sad_cfg_iio_topology() with 'dev' not NULL. We need to call pci_dev_put() to decrease the reference count. Since pci_dev_put() can handle the NULL input parameter, we can just add one pci_dev_put() right before 'return ret'. Fixes: c1777be3646b ("perf/x86/intel/uncore: Enable I/O stacks to IIO PMON mapping on SNR") 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/20221118063137.121512-2-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 ed869443efb2..76fedc8e12dd 100644 --- a/arch/x86/events/intel/uncore_snbep.c +++ b/arch/x86/events/intel/uncore_snbep.c @@ -4492,6 +4492,8 @@ static int sad_cfg_iio_topology(struct intel_uncore_type *type, u8 *sad_pmon_map type->topology = NULL; } + pci_dev_put(dev); + return ret; }