tee: amdtee: fix race condition in amdtee_open_session

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: tee: amdtee: fix race condition in amdtee_open_session There is a potential race condition in amdtee_open_session that may lead to use-after-free. For instance, in amdtee_open_session() after sess->sess_mask is set, and before setting: sess->session_info[i] = session_info; if amdtee_close_session() closes this same session, then 'sess' data structure will be released, causing kernel panic when 'sess' is accessed within amdtee_open_session(). The solution is to set the bit sess->sess_mask as the last step in amdtee_open_session().

References

• https://git.kernel.org/stable/c/f632a90f8e39db39b322107b9a8d438b826a7f4f
• https://git.kernel.org/stable/c/02b296978a2137d7128151c542e84dc96400bc00
• https://git.kernel.org/stable/c/a63cce9393e4e7dbc5af82dc87e68cb321cb1a78
• https://git.kernel.org/stable/c/b3ef9e6fe09f1a132af28c623edcf4d4f39d9f35
• https://git.kernel.org/stable/c/f8502fba45bd30e1a6a354d9d898bc99d1a11e6d