The quilt patch titled
Subject: resource: fix resource leak in get_free_mem_region()
has been removed from the -mm tree. Its filename was
resource-fix-resource-leak-in-get_free_mem_region.patch
This patch was dropped because an updated version will be issued
------------------------------------------------------
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
[akpm@xxxxxxxxxxxxxxxxxxxx: fix braceology]
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 | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/kernel/resource.c~resource-fix-resource-leak-in-get_free_mem_region
+++ a/kernel/resource.c
@@ -1998,8 +1998,11 @@ get_free_mem_region(struct device *dev,
if (flags & GFR_REQUEST_REGION) {
free_resource(res);
devres_free(dr);
- } else if (dev)
+ } 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
