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| author | Muchun Song <songmuchun@bytedance.com> | 2023-03-15 06:44:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-30 13:51:37 +0300 |
| commit | dfaceae2aaea1b0a80d1b3f14cc636db1f19cc34 (patch) | |
| tree | acc1294d28306c009af8faffaa921d37eeea543a /lib/notifier-error-inject.c | |
| parent | 8346d21d1d8a63f46f60e6899f4f80b1306acf32 (diff) | |
| download | linux-dfaceae2aaea1b0a80d1b3f14cc636db1f19cc34.tar.xz | |
mm: kfence: fix using kfence_metadata without initialization in show_object()
commit 1c86a188e03156223a34d09ce290b49bd4dd0403 upstream.
The variable kfence_metadata is initialized in kfence_init_pool(), then,
it is not initialized if kfence is disabled after booting. In this case,
kfence_metadata will be used (e.g. ->lock and ->state fields) without
initialization when reading /sys/kernel/debug/kfence/objects. There will
be a warning if you enable CONFIG_DEBUG_SPINLOCK. Fix it by creating
debugfs files when necessary.
Link: https://lkml.kernel.org/r/20230315034441.44321-1-songmuchun@bytedance.com
Fixes: 0ce20dd84089 ("mm: add Kernel Electric-Fence infrastructure")
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Tested-by: Marco Elver <elver@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: SeongJae Park <sjpark@amazon.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib/notifier-error-inject.c')
0 files changed, 0 insertions, 0 deletions