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authorDavid Hildenbrand <david@redhat.com>2022-03-23 00:47:09 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2022-03-23 01:57:10 +0300
commit7ea0d2d79da09d1f7d71c96a9c9bc1b5229360b5 (patch)
treeab93ada0412ecf7e4f35416fccfc7df0d6b9d942 /drivers/base/memory.c
parent8c9bb39816f01a309d30243da0ca91bd7e7bd1c2 (diff)
downloadlinux-7ea0d2d79da09d1f7d71c96a9c9bc1b5229360b5.tar.xz
drivers/base/memory: add memory block to memory group after registration succeeded
If register_memory() fails, we freed the memory block but already added the memory block to the group list, not good. Let's defer adding the block to the memory group to after registering the memory block device. We do handle it properly during unregister_memory(), but that's not called when the registration fails. Link: https://lkml.kernel.org/r/20220128144540.153902-1-david@redhat.com Fixes: 028fc57a1c36 ("drivers/base/memory: introduce "memory groups" to logically group memory blocks") Signed-off-by: David Hildenbrand <david@redhat.com> Reviewed-by: Oscar Salvador <osalvador@suse.de> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: "Rafael J. Wysocki" <rafael@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base/memory.c')
-rw-r--r--drivers/base/memory.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c
index abf407e45467..6ee2181adc3f 100644
--- a/drivers/base/memory.c
+++ b/drivers/base/memory.c
@@ -665,14 +665,16 @@ static int init_memory_block(unsigned long block_id, unsigned long state,
mem->nr_vmemmap_pages = nr_vmemmap_pages;
INIT_LIST_HEAD(&mem->group_next);
+ ret = register_memory(mem);
+ if (ret)
+ return ret;
+
if (group) {
mem->group = group;
list_add(&mem->group_next, &group->memory_blocks);
}
- ret = register_memory(mem);
-
- return ret;
+ return 0;
}
static int add_memory_block(unsigned long base_section_nr)