From: Sam Edwards <cfsworks@gmail.com> stable inclusion from stable-v6.6.121 commit 90a60fe61908afa0eaf7f8fcf1421b9b50e5f7ff category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/13688 CVE: CVE-2026-23136 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=... -------------------------------- commit 11194b416ef95012c2cfe5f546d71af07b639e93 upstream. When a fault occurs, the connection is abandoned, reestablished, and any pending operations are retried. The OSD client tracks the progress of a sparse-read reply using a separate state machine, largely independent of the messenger's state. If a connection is lost mid-payload or the sparse-read state machine returns an error, the sparse-read state is not reset. The OSD client will then interpret the beginning of a new reply as the continuation of the old one. If this makes the sparse-read machinery enter a failure state, it may never recover, producing loops like: libceph: [0] got 0 extents libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read libceph: data len 142248331 != extent len 0 libceph: osd0 (1)...:6801 socket error on read Therefore, reset the sparse-read state in osd_fault(), ensuring retries start from a clean state. Cc: stable@vger.kernel.org Fixes: f628d7999727 ("libceph: add sparse read support to OSD client") Signed-off-by: Sam Edwards <CFSworks@gmail.com> Reviewed-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Yuan can <yuancan@huawei.com> Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com> --- net/ceph/osd_client.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 866cef26ce2a..a86ba8b78575 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -4313,6 +4313,9 @@ static void osd_fault(struct ceph_connection *con) goto out_unlock; } + osd->o_sparse_op_idx = -1; + ceph_init_sparse_read(&osd->o_sparse_read); + if (!reopen_osd(osd)) kick_osd_requests(osd); maybe_request_map(osdc); -- 2.43.0