CVE-2022-49418 Information

Description

In the Linux kernel the following vulnerability has been resolved:

NFSv4: Fix free of uninitialized nfs4_label on referral lookup.

Send along the already-allocated fattr along with nfs4_fs_locations and drop the memcpy of fattr. We end up growing two more allocations but this fixes up a crash as:

PID: 790 TASK: ffff88811b43c000 CPU: 0 COMMAND: \ls\n 0 [ffffc90000857920] panic at ffffffff81b9bfde 1 [ffffc900008579c0] do_trap at ffffffff81023a9b 2 [ffffc90000857a10] do_error_trap at ffffffff81023b78 3 [ffffc90000857a58] exc_stack_segment at ffffffff81be1f45 4 [ffffc90000857a80] asm_exc_stack_segment at ffffffff81c009de 5 [ffffc90000857b08] nfs_lookup at ffffffffa0302322 [nfs] 6 [ffffc90000857b70] __lookup_slow at ffffffff813a4a5f 7 [ffffc90000857c60] walk_component at ffffffff813a86c4 8 [ffffc90000857cb8] path_lookupat at ffffffff813a9553 9 [ffffc90000857cf0] filename_lookup at ffffffff813ab86b

Reference

https://git.kernel.org/stable/c/6015292653d95ba9f72906e2b65e536aa5807d64 https://git.kernel.org/stable/c/c3ed222745d9ad7b69299b349a64ba533c64a34f https://git.kernel.org/stable/c/eb1fe9600b86c24a789046bfc5c6851dda119280