CVE-2021-46950 Information

Description

In the Linux kernel the following vulnerability has been resolved:

md/raid1: properly indicate failure when ending a failed write request

This patch addresses a data corruption bug in raid1 arrays using bitmaps. Without this fix the bitmap bits for the failed I/O end up being cleared.

Since we are in the failure leg of raid1_end_write_request the request either needs to be retried (R1BIO_WriteError) or failed (R1BIO_Degraded).

Reference

https://git.kernel.org/stable/c/12216d0919b64ee2ea5dc7a50e455670f44383d5 https://git.kernel.org/stable/c/a6e17cab00fc5bf85472434c52ac751426257c6f https://git.kernel.org/stable/c/6920cef604fa57f9409e3960413e9cc11f5c5a40 https://git.kernel.org/stable/c/661061a45e32d8b2cc0e306da9f169ad44011382 https://git.kernel.org/stable/c/59452e551784b7a57a45d971727e9db63b192515 https://git.kernel.org/stable/c/538244fba59fde17186322776247cd9c05be86dd https://git.kernel.org/stable/c/2417b9869b81882ab90fd5ed1081a1cb2d4db1dd