CVE-2024-53215

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

svcrdma: fix miss destroy percpucounter in svcrdmaprocinit()

There's issue as follows: RPC: Registered rdma transport module. RPC: Registered rdma backchannel transport module. RPC: Unregistered rdma transport module. RPC: Unregistered rdma backchannel transport module. BUG: unable to handle page fault for address: fffffbfff80c609a PGD 123fee067 P4D 123fee067 PUD 123fea067 PMD 10c624067 PTE 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN NOPTI RIP: 0010:percpucounterdestroymany+0xf7/0x2a0 Call Trace: <TASK> _die+0x1f/0x70 pagefaultoops+0x2cd/0x860 spuriouskernelfault+0x36/0x450 dokernaddrfault+0xca/0x100 excpagefault+0x128/0x150 asmexcpagefault+0x26/0x30 percpucounterdestroymany+0xf7/0x2a0 mmdrop+0x209/0x350 finishtaskswitch.isra.0+0x481/0x840 scheduletail+0xe/0xd0 retfromfork+0x23/0x80 retfromfork_asm+0x1a/0x30 </TASK>

If registersysctl() return NULL, then svcrdmaproccleanup() will not destroy the percpu counters which init in svcrdmaprocinit(). If CONFIGHOTPLUGCPU is enabled, residual nodes may be in the 'percpucounters' list. The above issue may occur once the module is removed. If the CONFIGHOTPLUGCPU configuration is not enabled, memory leakage occurs. To solve above issue just destroy all percpu counters when register_sysctl() return NULL.