nilfs2: fix infinite loop in nilfs_clean_segments()

Summary

In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix infinite loop in nilfs_clean_segments() syzbot reported a hung task in nilfs_transaction_begin(). This occurs because the cleaner ioctl falls into an infinite loop if nilfs_segctor_construct() repeatedly returns -EROFS (e.g. the device is remounted as read-only after an I/O error). Currently in nilfs_clean_segments(), if err is non-zero, it logs the error and sleeps but doesn't abort when it encounters a terminal error like -EROFS. This causes the thread to loop forever. Fix this by breaking out of the loop if nilfs_segctor_construct() returns -EROFS. This matches the behaviour in nilfs_segctor_write_out(), which also handles -EROFS.

Timeline

1. Sep 17, 2026, 4:09 PM UTCCVE published
2. Oct 19, 2026, 9:03 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 · fixed in e3e9367dae1a6392cbb14ab0b2ab5edbf39735c3; From 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 · fixed in 217b967ad7887a3e1ebc08f46f6484e081acd4b4; From 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 · fixed in 3bcdbdaac884a4baa59716cf9bd9470c75276e2d; From 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 · fixed in d7afca8e4efbf4c455b4663c29ae59fde2f1b671; From 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 · fixed in c07e5ad6539e7e9350d5c65cbf8adb69d1711b15; From 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 · fixed in 1fc6df85b4954b6fda9c351843aaca3c06f66d8d; From 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 · fixed in 8cea0bc78ac64cb88da49c07f80bf2cf9fb7aff8; From 9ff05123e3bfbb1d2b68ba1d9bf1f7d1dffc1453 · fixed in ce5a5ad1a8330a2fcfdd9ec2ab341be739e89a18

• Linux Linux

  2.6.30

• KernelLinux

  From 2.6.30 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8