CVE-2021-47130 Information

Description

In the Linux kernel the following vulnerability has been resolved:

nvmet: fix freeing unallocated p2pmem

In case p2p device was found but the p2p pool is empty the nvme target is still trying to free the sgl from the p2p pool instead of the regular sgl pool and causing a crash (BUG() is called). Instead assign the p2p_dev for the request only if it was allocated from p2p pool.

This is the crash that was caused:

[Sun May 30 19:13:53 2021] ————[ cut here ]———— [Sun May 30 19:13:53 2021] kernel BUG at lib/genalloc.c:518! [Sun May 30 19:13:53 2021] invalid opcode: 0000 [1] SMP PTI … [Sun May 30 19:13:53 2021] kernel BUG at lib/genalloc.c:518! … [Sun May 30 19:13:53 2021] RIP: 0010:gen_pool_free_owner+0xa8/0xb0 … [Sun May 30 19:13:53 2021] Call Trace: [Sun May 30 19:13:53 2021] ————[ cut here ]———— [Sun May 30 19:13:53 2021] pci_free_p2pmem+0x2b/0x70 [Sun May 30 19:13:53 2021] pci_p2pmem_free_sgl+0x4f/0x80 [Sun May 30 19:13:53 2021] nvmet_req_free_sgls+0x1e/0x80 [nvmet] [Sun May 30 19:13:53 2021] kernel BUG at lib/genalloc.c:518! [Sun May 30 19:13:53 2021] nvmet_rdma_release_rsp+0x4e/0x1f0 [nvmet_rdma] [Sun May 30 19:13:53 2021] nvmet_rdma_send_done+0x1c/0x60 [nvmet_rdma]

Reference

https://git.kernel.org/stable/c/c440cd080761b18a52cac20f2a42e5da1e3995af https://git.kernel.org/stable/c/8a452d62e7cea3c8a2676a3b89a9118755a1a271 https://git.kernel.org/stable/c/bcd9a0797d73eeff659582f23277e7ab6e5f18f3