HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Condition In the ssi_protocol_probe() function, &ssi->work is bound with ssip_xmit_work(), In ssip_pn_setup(), the ssip_pn_xmit() function within the ssip_pn_ops structure is capable of starting the work. If we remove the module which will call ssi_protocol_remove() to make a cleanup, it will free ssi through kfree(ssi), while the work mentioned above will be used. The sequence of operations that may lead to a UAF bug is as follows: CPU0 CPU1 | ssip_xmit_work ssi_protocol_remove | kfree(ssi); | | struct hsi_client *cl = ssi->cl; | // use ssi Fix it by ensuring that the work is canceled before proceeding with the cleanup in ssi_protocol_remove().

References

• https://git.kernel.org/stable/c/d03abc1c2b21324550fa71e12d53e7d3498e0af6
• https://git.kernel.org/stable/c/4a8c29beb8a02b5a0a9d77d608aa14b6f88a6b86
• https://git.kernel.org/stable/c/72972552d0d0bfeb2dec5daf343a19018db36ffa
• https://git.kernel.org/stable/c/d58493832e284f066e559b8da5ab20c15a2801d3
• https://git.kernel.org/stable/c/58eb29dba712ab0f13af59ca2fe545f5ce360e78
• https://git.kernel.org/stable/c/ae5a6a0b425e8f76a9f0677e50796e494e89b088
• https://git.kernel.org/stable/c/834e602d0cc7c743bfce734fad4a46cefc0f9ab1
• https://git.kernel.org/stable/c/4b4194c9a7a8f92db39e8e86c85f4fb12ebbec4f
• https://git.kernel.org/stable/c/e3f88665a78045fe35c7669d2926b8d97b892c11