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smb3: fix empty netname context on secondary channels

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Some servers do not allow null netname contexts, which would cause
multichannel to revert to single channel when mounting to some
servers (e.g. Azure xSMB).

Fixes: 4c14d7043f ("cifs: populate empty hostnames for extra channels")
Reviewed-by: Shyam Prasad N <sprasad@microsoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2022-06-18 17:24:23 -05:00
parent a111daf0c5
commit 73130a7b1a
1 changed files with 8 additions and 6 deletions
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14
fs/cifs/smb2pdu.c
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@ -570,16 +570,18 @@ assemble_neg_contexts(struct smb2_negotiate_req *req,
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
server->hostname);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
build_posix_ctxt((struct smb2_posix_neg_context *)pneg_ctxt);
*total_len += sizeof(struct smb2_posix_neg_context);
pneg_ctxt += sizeof(struct smb2_posix_neg_context);
neg_context_count = 4;
if (server->hostname && (server->hostname[0] != 0)) {
ctxt_len = build_netname_ctxt((struct smb2_netname_neg_context *)pneg_ctxt,
server->hostname);
*total_len += ctxt_len;
pneg_ctxt += ctxt_len;
neg_context_count = 4;
} else /* second channels do not have a hostname */
neg_context_count = 3;
if (server->compress_algorithm) {
build_compression_ctxt((struct smb2_compression_capabilities_context *)