cifs: make sure we do not overflow the max EA buffer size
RHBZ: 1752437 Before we add a new EA we should check that this will not overflow the maximum buffer we have available to read the EAs back. Otherwise we can get into a situation where the EAs are so big that we can not read them back to the client and thus we can not list EAs anymore or delete them. Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com> CC: Stable <stable@vger.kernel.org>
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