Vulnerability CVE-2024-40983
Published: 2024-07-12

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

tipc: force a dst refcount before doing decryption

As it says in commit 3bc07321ccc2 ("xfrm: Force a dst refcount before
entering the xfrm type handlers"):

"Crypto requests might return asynchronous. In this case we leave the
rcu protected region, so force a refcount on the skb's destination
entry before we enter the xfrm type input/output handlers."

On TIPC decryption path it has the same problem, and skb_dst_force()
should be called before doing decryption to avoid a possible crash.

Shuang reported this issue when this warning is triggered:

[] WARNING: include/net/dst.h:337 tipc_sk_rcv+0x1055/0x1ea0 [tipc]
[] Kdump: loaded Tainted: G W --------- - - 4.18.0-496.el8.x86_64+debug
[] Workqueue: crypto cryptd_queue_worker
[] RIP: 0010:tipc_sk_rcv+0x1055/0x1ea0 [tipc]
[] Call Trace:
[] tipc_sk_mcast_rcv+0x548/0xea0 [tipc]
[] tipc_rcv+0xcf5/0x1060 [tipc]
[] tipc_aead_decrypt_done+0x215/0x2e0 [tipc]
[] cryptd_aead_crypt+0xdb/0x190
[] cryptd_queue_worker+0xed/0x190
[] process_one_work+0x93d/0x17e0

 References:
https://git.kernel.org/stable/c/3eb1b39627892c4e26cb0162b75725aa5fcc60c8
https://git.kernel.org/stable/c/692803b39a36e63ac73208e0a3769ae6a2f9bc76
https://git.kernel.org/stable/c/623c90d86a61e3780f682b32928af469c66ec4c2
https://git.kernel.org/stable/c/b57a4a2dc8746cea58a922ebe31b6aa629d69d93
https://git.kernel.org/stable/c/6808b41371670c51feea14f63ade211e78100930
https://git.kernel.org/stable/c/2ebe8f840c7450ecbfca9d18ac92e9ce9155e269
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