[LU-13157] migrate symlink with target name length > 59 cause crash

• Type: Bug
• Resolution: Fixed
• Priority: Critical
• Fix Version/s: Lustre 2.14.0, Lustre 2.12.5
• Affects Version/s: Lustre 2.12.0
• Severity: 3
• Assignee: Lai Siyao
• Reporter: Lai Siyao

Description

mdd_migrate() allocate 'la_size + 1' for symlink target name, the extra '+1' is a mistake, which will cause read beyond range fault: if target name is 59 bytes long, then it will try to read target name from external block other than inline i_block[15], that's why when target name is shorter than 59 it won't cause any problem.

Issue Links

• is related to: LU-14988 crash in ll_migrate in racer
• is related to: LU-11578 ldiskfs_map_blocks: comm mdt00_100: lblock 0 mapped to illegal pblock

Comments

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/38112/
Subject: LU-13157 mdd: migrate readlink from wrong place
Project: fs/lustre-release
Branch: b2_12
Current Patch Set:
Commit: 6b105dcf5bd3b06881c54a1c5e877cebefc9b67c

[Gerrit Updater]

Minh Diep ([e-mail]) uploaded a new patch: https://review.whamcloud.com/38112
Subject: LU-13157 mdd: migrate readlink from wrong place
Project: fs/lustre-release
Branch: b2_12
Current Patch Set: 1
Commit: b51d487d16c5a001800afbb3143fb7f724b37439

[Peter Jones]

Landed for 2.14

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/37285/
Subject: LU-13157 mdd: migrate readlink from wrong place
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: a3b30423c6067b3e8644ecfb3269f8837af7e4cd

[Gerrit Updater]

Lai Siyao ([e-mail]) uploaded a new patch: https://review.whamcloud.com/37285
Subject: LU-13157 mdd: extra byte read in symlink migrate
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 7e2a5c31f9e231b740a7daf27bf1bd6476bd9b93