The patch titled
Subject: resource: fix resource leak in get_free_mem_region()
has been added to the -mm mm-nonmm-unstable branch. Its filename is
resource-fix-resource-leak-in-get_free_mem_region.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/resource-fix-resource-leak-in-get_free_mem_region.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Li Zhijian <lizhijian@xxxxxxxxxxx>
Subject: resource: fix resource leak in get_free_mem_region()
Date: Tue, 4 Mar 2025 12:34:15 +0800
The leak is detected by the kernel memory leak detector (`kmemleak`)
following a `cxl create-region` failure:
cxl_acpi ACPI0017:00: decoder0.0: created region2
cxl region2: HPA allocation error (-34) for size:0x0000000100000000 in CXL Window 0 [mem 0xa90000000-0x1a8fffffff flags 0x200]
kmemleak: 1 new suspected memory leaks (see /sys/kernel/debug/kmemleak)
__kmalloc_cache_noprof+0x28c/0x350
get_free_mem_region+0x45/0x380
alloc_free_mem_region+0x1d/0x30
size_store+0x180/0x290 [cxl_core]
kernfs_fop_write_iter+0x13f/0x1e0
vfs_write+0x37c/0x540
ksys_write+0x68/0xe0
do_syscall_64+0x6e/0x190
entry_SYSCALL_64_after_hwframe+0x76/0x7e
Link: https://lkml.kernel.org/r/20250304043415.610286-1-lizhijian@xxxxxxxxxxx
Fixes: 14b80582c43e ("resource: Introduce alloc_free_mem_region()")
Signed-off-by: Li Zhijian <lizhijian@xxxxxxxxxxx>
Cc: Andriy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Dan Wiliams <dan.j.williams@xxxxxxxxx>
Cc: "Huang, Ying" <huang.ying.caritas@xxxxxxxxx>
Cc: Ilpo Jarvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Cc: Joanthan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Cc: Mika Westeberg <mika.westerberg@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/resource.c | 2 ++
1 file changed, 2 insertions(+)
--- a/kernel/resource.c~resource-fix-resource-leak-in-get_free_mem_region
+++ a/kernel/resource.c
@@ -2000,6 +2000,8 @@ get_free_mem_region(struct device *dev,
devres_free(dr);
} else if (dev)
devm_release_action(dev, remove_free_mem_region, res);
+ else
+ free_resource(res);
return ERR_PTR(-ERANGE);
}
_
Patches currently in -mm which might be from lizhijian@xxxxxxxxxxx are
resource-fix-resource-leak-in-get_free_mem_region.patch
