xfs: restore nofs context unconditionally in xfs_trans_roll

Overview

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

xfs: restore nofs context unconditionally in xfs_trans_roll

When __xfs_trans_commit() fails in xfs_trans_roll(), the NOFS context is cleared but only restored in the success path. This leaves the error path without nofs protection, causing a circular lock dependency between xfs_nondir_ilock_class and fs_reclaim:

   CPU0                    CPU1
   ----                    ----

lock(&xfs_nondir_ilock_class); lock(fs_reclaim); lock(&xfs_nondir_ilock_class); lock(fs_reclaim);

Fix this by moving xfs_trans_set_context() before the error check so that nofs context is always restored on the new transaction.

Affected

• Linux >= a1ca658d649a4d8972e2e21ac2625b633217e327 < b09198cf90ccf296970b774beea1c1ddb260f94c
• Linux >= a1ca658d649a4d8972e2e21ac2625b633217e327 < 4d00a39c676274f4071b467e630565ac1e3ae0f2
• Linux >= a1ca658d649a4d8972e2e21ac2625b633217e327 < 0241ea5fb0fe86d2a673163b2f5815111aadc7f7
• Linux 7.0

Remediation

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