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| author | Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> | 2022-07-20 23:47:55 +0900 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-07-29 18:07:13 -0700 |
| commit | 14773bfa70e67f4d4ebd60e60cb6e25e8c84d4c0 (patch) | |
| tree | 67152cd43719fd51e7975bf56bf1194bafbfa181 /mm/shrinker_debug.c | |
| parent | 187e7c41445a0f202bb551f08ca7f8158fea1cd7 (diff) | |
| download | linux-14773bfa70e67f4d4ebd60e60cb6e25e8c84d4c0.tar.bz2 | |
mm: shrinkers: fix double kfree on shrinker name
syzbot is reporting double kfree() at free_prealloced_shrinker() [1], for
destroy_unused_super() calls free_prealloced_shrinker() even if
prealloc_shrinker() returned an error. Explicitly clear shrinker name
when prealloc_shrinker() called kfree().
[roman.gushchin@linux.dev: zero shrinker->name in all cases where shrinker->name is freed]
Link: https://lkml.kernel.org/r/YtgteTnQTgyuKUSY@castle
Link: https://syzkaller.appspot.com/bug?extid=8b481578352d4637f510 [1]
Link: https://lkml.kernel.org/r/ffa62ece-6a42-2644-16cf-0d33ef32c676@I-love.SAKURA.ne.jp
Fixes: e33c267ab70de424 ("mm: shrinkers: provide shrinkers with names")
Reported-by: syzbot <syzbot+8b481578352d4637f510@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Acked-by: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/shrinker_debug.c')
| -rw-r--r-- | mm/shrinker_debug.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/mm/shrinker_debug.c b/mm/shrinker_debug.c index e5b40c43221d..b05295bab322 100644 --- a/mm/shrinker_debug.c +++ b/mm/shrinker_debug.c @@ -251,6 +251,7 @@ void shrinker_debugfs_remove(struct shrinker *shrinker) lockdep_assert_held(&shrinker_rwsem); kfree_const(shrinker->name); + shrinker->name = NULL; if (!shrinker->debugfs_entry) return; |