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

mlxsw: spectrum_acl_tcam: Fix incorrect list API usage

Both the function that migrates all the chunks within a region and the
function that migrates all the entries within a chunk call
list_first_entry() on the respective lists without checking that the
lists are not empty. This is incorrect usage of the API, which leads to
the following warning [1].

Fix by returning if the lists are empty as there is nothing to migrate
in this case.

[1]
WARNING: CPU: 0 PID: 6437 at drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c:1266 mlxsw_sp_acl_tcam_vchunk_migrate_all+0x1f1/0>
Modules linked in:
CPU: 0 PID: 6437 Comm: kworker/0:37 Not tainted 6.9.0-rc3-custom-00883-g94a65f079ef6 #39
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:mlxsw_sp_acl_tcam_vchunk_migrate_all+0x1f1/0x2c0
[...]
Call Trace:
 <TASK>
 mlxsw_sp_acl_tcam_vregion_rehash_work+0x6c/0x4a0
 process_one_work+0x151/0x370
 worker_thread+0x2cb/0x3e0
 kthread+0xd0/0x100
 ret_from_fork+0x34/0x50
 ret_from_fork_asm+0x1a/0x30
 </TASK>

kernel.org https://git.kernel.org/stable/c/09846c2309b150b8ce4e0ce96f058197598fc530 [No types assigned]

kernel.org https://git.kernel.org/stable/c/0b2c13b670b168e324e1cf109e67056a20fd610a [No types assigned]

kernel.org https://git.kernel.org/stable/c/4526a56e02da3725db979358964df9cd9c567154 [No types assigned]

kernel.org https://git.kernel.org/stable/c/64435b64e43d8ee60faa46c0cd04e323e8b2a7b0 [No types assigned]

kernel.org https://git.kernel.org/stable/c/ab4ecfb627338e440ae11def004c524a00d93e40 [No types assigned]

kernel.org https://git.kernel.org/stable/c/af8b593c3dd9df82cb199be65863af004b09fd97 [No types assigned]

kernel.org https://git.kernel.org/stable/c/b377add0f0117409c418ddd6504bd682ebe0bf79 [No types assigned]