cifs: mask off top byte in get_rfc1002_length()

[mirror_ubuntu-artful-kernel.git] / fs / cifs / smb2pdu.c

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index a3f7a9c3cc69d81ef4ce58b8f509dda288fa6602..860344701067f49169e20a8a41df55145fa5f023 100644 (file)
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -413,7 +413,9 @@ SMB2_negotiate(const unsigned int xid, struct cifs_ses *ses)
 
        /* SMB2 only has an extended negflavor */
        server->negflavor = CIFS_NEGFLAVOR_EXTENDED;
-       server->maxBuf = le32_to_cpu(rsp->MaxTransactSize);
+       /* set it to the maximum buffer size value we can send with 1 credit */
+       server->maxBuf = min_t(unsigned int, le32_to_cpu(rsp->MaxTransactSize),
+                              SMB2_MAX_BUFFER_SIZE);
        server->max_read = le32_to_cpu(rsp->MaxReadSize);
        server->max_write = le32_to_cpu(rsp->MaxWriteSize);
        /* BB Do we need to validate the SecurityMode? */