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authorShaohua Li <shli@fb.com>2017-11-07 20:09:50 +0100
committerJens Axboe <axboe@kernel.dk>2017-11-11 03:53:25 +0100
commite10237cc76ef9a4066a84aa2cc710bfd708cc341 (patch)
tree6e096297e263119d7c6b80f7e8ff538827e04e3f /block
parentnvmet: fix comment typos in admin-cmd.c (diff)
downloadlinux-e10237cc76ef9a4066a84aa2cc710bfd708cc341.tar.xz
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kthread: zero the kthread data structure
kthread() could bail out early before we initialize blkcg_css (if the kthread is killed very early. Please see xchg() statement in kthread()), which confuses free_kthread_struct. Instead of moving the blkcg_css initialization early, we simply zero the whole 'self' data structure, which doesn't sound much overhead. Reported-by: syzbot <syzkaller@googlegroups.com> Fixes: 05e3db95ebfc ("kthread: add a mechanism to store cgroup info") Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Dmitry Vyukov <dvyukov@google.com> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Shaohua Li <shli@fb.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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