percpu_ref: don't refer to ref->data if it isn't allocated

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We can't check ref->data->confirm_switch directly in __percpu_ref_exit(), since
ref->data may not be allocated in one not-initialized refcount.

Fixes: 2b0d3d3e4f ("percpu_ref: reduce memory footprint of percpu_ref in fast path")
Reported-by: syzbot+fd15ff734dace9e16437@syzkaller.appspotmail.com
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Ming Lei 2020-10-09 12:03:56 +08:00 • committed by Jens Axboe

parent f4ac712e4f

commit 7ea6bf2e6c

1 changed files with 1 additions and 1 deletions

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lib/percpu-refcount.c

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