CVE-2024-36006

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>