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When quotaon(8) races with __dquot_initialize() or dqget() fails because of EIO, ENOSPC, or similar error, we could possibly dereference NULL pointer in inode->i_dquot[cnt]. Add proper checking. Reported-by: Dmitry Monakhov <dmonakhov@gmail.com> Signed-off-by: Jan Kara <jack@suse.cz>