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smb: client: Fix match_session bug preventing session reuse

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[ Upstream commit 605b249ea96770ac4fac4b8510a99e0f8442be5e ]

Fix a bug in match_session() that can causes the session to not be
reused in some cases.

Reproduction steps:

mount.cifs //server/share /mnt/a -o credentials=creds
mount.cifs //server/share /mnt/b -o credentials=creds,sec=ntlmssp
cat /proc/fs/cifs/DebugData | grep SessionId | wc -l

mount.cifs //server/share /mnt/b -o credentials=creds,sec=ntlmssp
mount.cifs //server/share /mnt/a -o credentials=creds
cat /proc/fs/cifs/DebugData | grep SessionId | wc -l

Cc: stable@vger.kernel.org
Reviewed-by: Enzo Matsumiya <ematsumiya@suse.de>
Signed-off-by: Henrique Carvalho <henrique.carvalho@suse.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Henrique Carvalho
2025-03-11 15:23:59 -03:00
committed by Greg Kroah-Hartman
parent 98bbcf4cca
commit dda134d117
1 changed files with 12 additions and 4 deletions
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16
fs/smb/client/connect.c
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@@ -1881,9 +1881,8 @@ out_err:
/* this function must be called with ses_lock and chan_lock held */
static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
{
if (ctx->sectype != Unspecified &&
ctx->sectype != ses->sectype)
return 0;
struct TCP_Server_Info *server = ses->server;
enum securityEnum ctx_sec, ses_sec;
/*
* If an existing session is limited to less channels than
@@ -1892,11 +1891,20 @@ static int match_session(struct cifs_ses *ses, struct smb3_fs_context *ctx)
if (ses->chan_max < ctx->max_channels)
return 0;
switch (ses->sectype) {
ctx_sec = server->ops->select_sectype(server, ctx->sectype);
ses_sec = server->ops->select_sectype(server, ses->sectype);
if (ctx_sec != ses_sec)
return 0;
switch (ctx_sec) {
case IAKerb:
case Kerberos:
if (!uid_eq(ctx->cred_uid, ses->cred_uid))
return 0;
break;
case NTLMv2:
case RawNTLMSSP:
default:
/* NULL username means anonymous session */
if (ses->user_name == NULL) {