Commit 9c2dc11d authored May 07, 2021 by Steve French

smb3: do not attempt multichannel to server which does not support it



We were ignoring CAP_MULTI_CHANNEL in the server response - if the
server doesn't support multichannel we should not be attempting it.

See MS-SMB2 section 3.2.5.2

Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-By: Tom Talpey <tom@talpey.com>
Cc: <stable@vger.kernel.org> # v5.8+
Signed-off-by: Steve French <stfrench@microsoft.com>

parent 679971e7

fs/cifs/sess.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -97,6 +97,12 @@ int cifs_try_adding_channels(struct cifs_sb_info cifs_sb, struct cifs_ses ses)
		return 0;
		}

		if (!(ses->server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) {
		cifs_dbg(VFS, "server %s does not support multichannel\n", ses->server->hostname);
		ses->chan_max = 1;
		return 0;
		}

		/*
		* Make a copy of the iface list at the time and use that
		* instead so as to not hold the iface spinlock for opening