Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: NFSD: fix use-after-free on source server when doing inter-server copy Use-after-free occurred when the laundromat tried to free expired cpntf_state entry on the s2s_cp_stateids list after inter-server copy completed. The sc_cp_list that the expired copy state was inserted on was already freed. When COPY completes, the Linux client normally sends LOCKU(lock_state x), FREE_STATEID(lock_state x) and CLOSE(open_state y) to the source server. The nfs4_put_stid call from nfsd4_free_stateid cleans up the copy state from the s2s_cp_stateids list before freeing the lock state's stid. However, sometimes the CLOSE was sent before the FREE_STATEID request. When this happens, the nfsd4_close_open_stateid call from nfsd4_close frees all lock states on its st_locks list without cleaning up the copy state on the sc_cp_list list. When the time the FREE_STATEID arrives the server returns BAD_STATEID since the lock state was freed. This causes the use-after-free error to occur when the laundromat tries to free the expired cpntf_state. This patch adds a call to nfs4_free_cpntf_statelist in nfsd4_close_open_stateid to clean up the copy state before calling free_ol_stateid_reaplist to free the lock state's stid on the reaplist.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 624322f1adc58acd0b69f77a6ddc764207e97241 before bbacfcde5fff25ac22597e8373a065c647da6738; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before 83b94969751a691347606dbe6b1865efcfa5a643; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before 6ea71246b7a02af675d733e72d14bd0d591d5f4a; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before 35aa0fb8c3033a3d78603356e96fc18c5b9cceb2; affected 624322f1adc58acd0b69f77a6ddc764207e97241 before 019805fea91599b22dfa62ffb29c022f35abeb06 |
| Linux / Linux | affected 5.6; unaffected 0 before 5.6; unaffected 5.10.150 through 5.10.*; unaffected 5.15.75 through 5.15.*; unaffected 5.19.17 through 5.19.*; unaffected 6.0.3 through 6.0.*; unaffected 6.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/bbacfcde5fff25ac22597e8373a065c647da6738
- https://git.kernel.org/stable/c/83b94969751a691347606dbe6b1865efcfa5a643
- https://git.kernel.org/stable/c/6ea71246b7a02af675d733e72d14bd0d591d5f4a
- https://git.kernel.org/stable/c/35aa0fb8c3033a3d78603356e96fc18c5b9cceb2
- https://git.kernel.org/stable/c/019805fea91599b22dfa62ffb29c022f35abeb06
ADP enrichment
No English description supplied.
No references supplied.