Description: thunderbolt: Fix NULL pointer dereference in tb_port_update_credits()
References:
Notes:
 carnil> Introduced in 81af2952e606 ("thunderbolt: Add support for asymmetric link").
 carnil> Vulnerable versions: 6.7-rc1.
Bugs:
upstream: released (6.8) [d3d17e23d1a0d1f959b4fa55b35f1802d9c584fa]
6.8-upstream-stable: released (6.8) [d3d17e23d1a0d1f959b4fa55b35f1802d9c584fa]
6.6-upstream-stable: N/A "Vulnerable code not present"
6.1-upstream-stable: N/A "Vulnerable code not present"
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.7.12-1)
6.1-bookworm-security: N/A "Vulnerable code not present"
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"