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

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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>
This commit is contained in:
Steve French 2021-05-07 20:00:41 -05:00
parent 679971e721
commit 9c2dc11df5
1 changed files with 6 additions and 0 deletions
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6
fs/cifs/sess.c
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@ -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