dm btree: fix order of block initialization in btree_split_beneath
mainline inclusion from mainline-v5.3-rc6 commit e4f9d601 category: bugfix bugzilla: 20701 CVE: NA ------------------------------------------------- When btree_split_beneath() splits a node to two new children, it will allocate two blocks: left and right. If right block's allocation failed, the left block will be unlocked and marked dirty. If this happened, the left block'ss content is zero, because it wasn't initialized with the btree struct before the attempot to allocate the right block. Upon return, when flushing the left block to disk, the validator will fail when check this block. Then a BUG_ON is raised. Fix this by completely initializing the left block before allocating and initializing the right block. Fixes: 4dcb8b57 ("dm btree: fix leak of bufio-backed block in btree_split_beneath error path") Cc: stable@vger.kernel.org Signed-off-by: NZhangXiaoxu <zhangxiaoxu5@huawei.com> Signed-off-by: NMike Snitzer <snitzer@redhat.com> Signed-off-by: NZhangXiaoxu <zhangxiaoxu5@huawei.com> Reviewed-by: NYufen Yu <yuyufen@huawei.com> Signed-off-by: NYang Yingliang <yangyingliang@huawei.com>
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