md/raid10: fix null-ptr-deref in raid10_sync_request

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: md/raid10: fix null-ptr-deref in raid10_sync_request init_resync() inits mempool and sets conf->have_replacemnt at the beginning of sync, close_sync() frees the mempool when sync is completed. After [1] recovery might be skipped and init_resync() is called but close_sync() is not. null-ptr-deref occurs with r10bio->dev[i].repl_bio. The following is one way to reproduce the issue. 1) create a array, wait for resync to complete, mddev->recovery_cp is set to MaxSector. 2) recovery is woken and it is skipped. conf->have_replacement is set to 0 in init_resync(). close_sync() not called. 3) some io errors and rdev A is set to WantReplacement. 4) a new device is added and set to A's replacement. 5) recovery is woken, A have replacement, but conf->have_replacemnt is 0. r10bio->dev[i].repl_bio will not be alloced and null-ptr-deref occurs. Fix it by not calling init_resync() if recovery skipped. [1] commit 7e83ccbecd60 ("md/raid10: Allow skipping recovery when clean arrays are assembled")

References

• https://git.kernel.org/stable/c/38d33593260536840b49fd1dcac9aedfd14a9d42
• https://git.kernel.org/stable/c/14964127be77884003976a392c9faa9ebaabbbe1
• https://git.kernel.org/stable/c/bdbf104b1c91fbf38f82c522ebf75429f094292a
• https://git.kernel.org/stable/c/68695084077e3de9d3e94e09238ace2b6f246446
• https://git.kernel.org/stable/c/b50fd1c3d9d0175aa29ff2706ef36cc178bc356a
• https://git.kernel.org/stable/c/99b503e4edc5938885d839cf0e7571963f75d800
• https://git.kernel.org/stable/c/9e9efc77efd1956cc244af975240f2513d78a371
• https://git.kernel.org/stable/c/a405c6f0229526160aa3f177f65e20c86fce84c5