Improper Input Validation Affecting kernel package, versions <0:4.14.256-197.484.amzn2

Note: Versions mentioned in the description apply only to the upstream kernel package and not the kernel package as distributed by Amazon-Linux. See How to fix? for Amazon-Linux:2 relevant fixed versions and status.

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

scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()

When parsing the txq list in lpfc_drain_txq(), the driver attempts to pass the requests to the adapter. If such an attempt fails, a local "fail_msg" string is set and a log message output. The job is then added to a completions list for cancellation.

Processing of any further jobs from the txq list continues, but since "fail_msg" remains set, jobs are added to the completions list regardless of whether a wqe was passed to the adapter. If successfully added to txcmplq, jobs are added to both lists resulting in list corruption.

Fix by clearing the fail_msg string after adding a job to the completions list. This stops the subsequent jobs from being added to the completions list unless they had an appropriate failure.

• http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-47203
• https://git.kernel.org/stable/c/16bcbfb56d759c25665f786e33ec633b9508a08f
• https://git.kernel.org/stable/c/814d3610c4ce86e8cf285b2cdac0057a42e82de5
• https://git.kernel.org/stable/c/99154581b05c8fb22607afb7c3d66c1bace6aa5d
• https://git.kernel.org/stable/c/ad4776b5eb2e58af1226847fcd3b4f6d051674dd
• https://git.kernel.org/stable/c/b291d147d0268e93ad866f8bc820ea14497abc9b
• https://git.kernel.org/stable/c/c097bd5a59162156d9c2077a2f58732ffbaa9fca
• https://git.kernel.org/stable/c/ec70d80a8642900086447ba0cdc79e3f44d42e8f
• https://git.kernel.org/stable/c/f05a0191b90156e539cccc189b9d87ca2a4d9305