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smb3: add credits we receive from oplock/break PDUs

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Otherwise we gradually leak credits leading to potential
hung session.

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
CC: Stable <stable@vger.kernel.org>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Ronnie Sahlberg 2019-01-23 16:20:38 +10:00 committed by Steve French
parent 6a9cbdd1ce
commit 2e5700bdde
1 changed files with 7 additions and 0 deletions
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7
fs/cifs/smb2misc.c
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@ -648,6 +648,13 @@ smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
if (rsp->sync_hdr.Command != SMB2_OPLOCK_BREAK)
return false;
if (rsp->sync_hdr.CreditRequest) {
spin_lock(&server->req_lock);
server->credits += le16_to_cpu(rsp->sync_hdr.CreditRequest);
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
}
if (rsp->StructureSize !=
smb2_rsp_struct_sizes[SMB2_OPLOCK_BREAK_HE]) {
if (le16_to_cpu(rsp->StructureSize) == 44)