In the Linux kernel, the following vulnerability has been resolved:

tee: optee: prevent use-after-free when the client exits before the supplicant

Commit 70b0d6b0a199 ("tee: optee: Fix supplicant wait loop") made the
client wait as killable so it can be interrupted during shutdown or
after a supplicant crash. This changes the original lifetime expectations:
the client task can now terminate while the supplicant is still processing
its request.

If the client exits first it removes the request from its queue and
kfree()s it, while the request ID remains in supp->idr. A subsequent
lookup on the supplicant path then dereferences freed memory, leading to
a use-after-free.

Serialise access to the request with supp->mutex:

  * Hold supp->mutex in optee_supp_recv() and optee_supp_send() while
    looking up and touching the request.
  * Let optee_supp_thrd_req() notice that the client has terminated and
    signal optee_supp_send() accordingly.

With these changes the request cannot be freed while the supplicant still
has a reference, eliminating the race.

https://git.kernel.org/stable/c/373152c94e57e9592b68c100e224fbd943cfd608

https://git.kernel.org/stable/c/387a926ee166814611acecb960207fe2f3c4fd3e

https://git.kernel.org/stable/c/416259cb5bffecaaae5f76539deb535a8c1b2c34

https://git.kernel.org/stable/c/724d0caffd4204b46f78efe22f18f8338031c6e1

https://git.kernel.org/stable/c/9a0dc9279d0907b198f205a693aedf696b08145d

https://git.kernel.org/stable/c/ae847ab29ded2d7cece4d5970f0edefa4137bf2f

https://git.kernel.org/stable/c/d366a01475f927402c96a3fe78bfc06b924fc87d

https://git.kernel.org/stable/c/d5b57bb314d79e99bebb58a53588fa11dd4dbf69

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