sctp: set sk_state back to CLOSED if autobind fails in sctp_listen_start

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: sctp: set sk_state back to CLOSED if autobind fails in sctp_listen_start In sctp_listen_start() invoked by sctp_inet_listen(), it should set the sk_state back to CLOSED if sctp_autobind() fails due to whatever reason. Otherwise, next time when calling sctp_inet_listen(), if sctp_sk(sk)->reuse is already set via setsockopt(SCTP_REUSE_PORT), sctp_sk(sk)->bind_hash will be dereferenced as sk_state is LISTENING, which causes a crash as bind_hash is NULL. KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:sctp_inet_listen+0x7f0/0xa20 net/sctp/socket.c:8617 Call Trace: <TASK> __sys_listen_socket net/socket.c:1883 [inline] __sys_listen+0x1b7/0x230 net/socket.c:1894 __do_sys_listen net/socket.c:1902 [inline]

References

• https://git.kernel.org/stable/c/89bbead9d897c77d0b566349c8643030ff2abeba
• https://git.kernel.org/stable/c/0e4e2e60556c6ed00e8450b720f106a268d23062
• https://git.kernel.org/stable/c/dd70c8a89ef99c3d53127fe19e51ef47c3f860fa
• https://git.kernel.org/stable/c/e7a8442195e8ebd97df467ce4742980ab57edcce
• https://git.kernel.org/stable/c/9230a59eda0878d7ecaa901d876aec76f57bd455
• https://git.kernel.org/stable/c/7f64cb5b4d8c872296eda0fdce3bcf099eec7aa7
• https://git.kernel.org/stable/c/f032e1dac30b3376c7d6026fb01a8c403c47a80d
• https://git.kernel.org/stable/c/e914bf68dab88815a7ae7b7a3a5e8913c8ff14a5
• https://git.kernel.org/stable/c/8beee4d8dee76b67c75dc91fd8185d91e845c160