CVE ID:	CVE-2024-35853
Description:	In the Linux kernel, the following vulnerability has been resolved: mlxsw: spectrum_acl_tcam: Fix memory leak during rehash The rehash delayed work migrates filters from one region to another. This is done by iterating over all chunks (all the filters with the same priority) in the region and in each chunk iterating over all the filters. If the migration fails, the code tries to migrate the filters back to the old region. However, the rollback itself can also fail in which case another migration will be erroneously performed. Besides the fact that this ping pong is not a very good idea, it also creates a problem. Each virtual chunk references two chunks: The currently used one ('vchunk->chunk') and a backup ('vchunk->chunk2'). During migration the first holds the chunk we want to migrate filters to and the second holds the chunk we are migrating filters from. The code currently assumes - but does not verify - that the backup chunk does not exist (NULL) if the currently used chunk does not reference the target region. This assumption breaks when we are trying to rollback a rollback, resulting in the backup chunk being overwritten and leaked [1]. Fix by not rolling back a failed rollback and add a warning to avoid future cases. [1] WARNING: CPU: 5 PID: 1063 at lib/parman.c:291 parman_destroy+0x17/0x20 Modules linked in: CPU: 5 PID: 1063 Comm: kworker/5:11 Tainted: G W 6.9.0-rc2-custom-00784-gc6a05c468a0b #14 Hardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 01/06/2019 Workqueue: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work RIP: 0010:parman_destroy+0x17/0x20 [...] Call Trace: mlxsw_sp_acl_atcam_region_fini+0x19/0x60 mlxsw_sp_acl_tcam_region_destroy+0x49/0xf0 mlxsw_sp_acl_tcam_vregion_rehash_work+0x1f1/0x470 process_one_work+0x151/0x370 worker_thread+0x2cb/0x3e0 kthread+0xd0/0x100 ret_from_fork+0x34/0x50 ret_from_fork_asm+0x1a/0x30
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2024-35853 https://git.kernel.org/stable/c/0ae8ff7b6d42e33943af462910bdcfa2ec0cb8cf https://git.kernel.org/stable/c/0ae8ff7b6d42e33943af462910bdcfa2ec0cb8cf https://git.kernel.org/stable/c/413a01886c3958d4b8aac23a3bff3d430b92093e https://git.kernel.org/stable/c/413a01886c3958d4b8aac23a3bff3d430b92093e https://git.kernel.org/stable/c/617e98ba4c50f4547c9eb0946b1cfc26937d70d1 https://git.kernel.org/stable/c/617e98ba4c50f4547c9eb0946b1cfc26937d70d1 https://git.kernel.org/stable/c/8ca3f7a7b61393804c46f170743c3b839df13977 https://git.kernel.org/stable/c/8ca3f7a7b61393804c46f170743c3b839df13977 https://git.kernel.org/stable/c/b3fd51f684a0711504f82de510da109ae639722d https://git.kernel.org/stable/c/b3fd51f684a0711504f82de510da109ae639722d https://git.kernel.org/stable/c/b822644fd90992ee362c5e0c8d2556efc8856c76 https://git.kernel.org/stable/c/b822644fd90992ee362c5e0c8d2556efc8856c76 https://git.kernel.org/stable/c/c6f3fa7f5a748bf6e5c4eb742686d6952f854e76 https://git.kernel.org/stable/c/c6f3fa7f5a748bf6e5c4eb742686d6952f854e76