outstanding credits must be initialized to 0, because it means the sum of credits consumed by in-flight requests. And outstanding credits must be compared with total credits in smb2_validate_credit_charge(), because total credits are the sum of credits granted by ksmbd.

This patch fix the following error, while frametest with Windows clients:

Limits exceeding the maximum allowable outstanding requests, given : 128, pending : 8065

Fixes: b589f5db6d4a ("ksmbd: limits exceeding the maximum allowable outstanding requests") Cc: stable@vger.kernel.org Signed-off-by: Hyunchul Lee hyc.lee@gmail.com Reported-by: Yufan Chen wiz.chen@gmail.com Tested-by: Yufan Chen wiz.chen@gmail.com --- changes from v2: - fix underflow issue of outstanding credits while mutli-protocol negotiation with an Windows client changes from v1: - Add "Fixes" and stable tags

fs/ksmbd/connection.c | 2 +- fs/ksmbd/smb2misc.c | 2 +- fs/ksmbd/smb_common.c | 4 +++- 3 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/ksmbd/connection.c b/fs/ksmbd/connection.c index 7db87771884a..e8f476c5f189 100644 --- a/fs/ksmbd/connection.c +++ b/fs/ksmbd/connection.c @@ -62,7 +62,7 @@ struct ksmbd_conn *ksmbd_conn_alloc(void) atomic_set(&conn->req_running, 0); atomic_set(&conn->r_count, 0); conn->total_credits = 1; - conn->outstanding_credits = 1; + conn->outstanding_credits = 0;

init_waitqueue_head(&conn->req_running_q); INIT_LIST_HEAD(&conn->conns_list); diff --git a/fs/ksmbd/smb2misc.c b/fs/ksmbd/smb2misc.c index 4a9460153b59..f8f456377a51 100644 --- a/fs/ksmbd/smb2misc.c +++ b/fs/ksmbd/smb2misc.c @@ -338,7 +338,7 @@ static int smb2_validate_credit_charge(struct ksmbd_conn *conn, ret = 1; }

- if ((u64)conn->outstanding_credits + credit_charge > conn->vals->max_credits) { + if ((u64)conn->outstanding_credits + credit_charge > conn->total_credits) { ksmbd_debug(SMB, "Limits exceeding the maximum allowable outstanding requests, given : %u, pending : %u\n", credit_charge, conn->outstanding_credits); ret = 1; diff --git a/fs/ksmbd/smb_common.c b/fs/ksmbd/smb_common.c index 9a7e211dbf4f..a336715e35e5 100644 --- a/fs/ksmbd/smb_common.c +++ b/fs/ksmbd/smb_common.c @@ -140,8 +140,10 @@ int ksmbd_verify_smb_message(struct ksmbd_work *work)

hdr = work->request_buf; if (*(__le32 *)hdr->Protocol == SMB1_PROTO_NUMBER && - hdr->Command == SMB_COM_NEGOTIATE) + hdr->Command == SMB_COM_NEGOTIATE) { + work->conn->outstanding_credits += 1; return 0; + }

return -EINVAL; }