From 6e811bbbc2ea3b20854c45fa29811640881bb534 Mon Sep 17 00:00:00 2001 From: Kent Overstreet Date: Sun, 10 Apr 2022 14:36:10 -0400 Subject: [PATCH] bcachefs: Fix a null ptr deref We start doing allocations before the GC thread is created, which means we need to check for that to avoid a null ptr deref. Signed-off-by: Kent Overstreet --- fs/bcachefs/btree_gc.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/bcachefs/btree_gc.h b/fs/bcachefs/btree_gc.h index 8de54005e4ea..95d803b5743d 100644 --- a/fs/bcachefs/btree_gc.h +++ b/fs/bcachefs/btree_gc.h @@ -105,7 +105,8 @@ static inline bool gc_visited(struct bch_fs *c, struct gc_pos pos) static inline void bch2_do_gc_gens(struct bch_fs *c) { atomic_inc(&c->kick_gc); - wake_up_process(c->gc_thread); + if (c->gc_thread) + wake_up_process(c->gc_thread); } #endif /* _BCACHEFS_BTREE_GC_H */