CVE-2024-26800

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

tls: fix use-after-free on failed backlog decryption

When the decrypt request goes to the backlog and crypto_aead_decrypt

returns -EBUSY, tls_do_decryption will wait until all async

decryptions have completed. If one of them fails, tls_do_decryption

will return -EBADMSG and tls_decrypt_sg jumps to the error path,

releasing all the pages. But the pages have been passed to the async

callback, and have already been released by tls_decrypt_done.

The only true async case is when crypto_aead_decrypt returns

-EINPROGRESS. With -EBUSY, we already waited so we can tell

tls_sw_recvmsg that the data is available for immediate copy, but we

need to notify tls_decrypt_sg (via the new ->async_done flag) that the

memory has already been released.