xfs: don't let memory failures leak blocks and kill repairs

Overview

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

xfs: don't let memory failures leak blocks and kill repairs

LOLLM complains that a memory allocation failure in xrep_newbt_add_blocks results in online repair leaking blocks that were previously allocated to write a new btree, but the problem is worse than that -- a limitation of the codebase is that the callers cannot undo the transaction /and/ return the error -- either you undo all changes and commit the transaction, or you error out and the filesystem goes down.

However, the new btree space reservation object isn't that big (~48 bytes). Let's just do a NOFAIL allocation and the problem goes away.

Affected

• Linux >= be408417630427984a1fddd069f30b245793234c < 3380151cf0ce8ad0c1d356fed51e4b69e1d28e50
• Linux >= be408417630427984a1fddd069f30b245793234c < b15c79fca28060fd9c7e77f2c3ebc4ba023974e8
• Linux >= be408417630427984a1fddd069f30b245793234c < 0e0d3372a84029da1768c7a4c4601484af5b58a2
• Linux >= be408417630427984a1fddd069f30b245793234c < ab1c416d2377cdc16123ef521aac4da1c468c3d4
• Linux 6.8

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.