Description: af_unix: Fix task hung while purging oob_skb in GC.
References:
Notes:
 carnil> Introduced in 1279f9d9dec2 ("af_unix: Call kfree_skb() for dead
 carnil> unix_(sk)->oob_skb in GC."). Vulnerable versions: 5.15.149 6.1.78 6.6.17 6.7.5
 carnil> 6.8-rc4.
Bugs:
upstream: released (6.8-rc5) [25236c91b5ab4a26a56ba2e79b8060cf4e047839]
6.7-upstream-stable: released (6.7.9) [cb8890318dde26fc89c6ea67d6e9070ab50b6e91]
6.6-upstream-stable: released (6.6.21) [69e0f04460f4037e01e29f0d9675544f62aafca3]
6.1-upstream-stable: released (6.1.81) [2a3d40b4025fcfe51b04924979f1653993b17669]
5.10-upstream-stable: N/A "Vulnerable code not present"
4.19-upstream-stable: N/A "Vulnerable code not present"
sid: released (6.7.9-1)
6.1-bookworm-security: released (6.1.82-1)
5.10-bullseye-security: N/A "Vulnerable code not present"
4.19-buster-security: N/A "Vulnerable code not present"