6.6-stable review patch. If anyone has any objections, please let me know.
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From: Henrique Carvalho henrique.carvalho@suse.com
[ 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 --- fs/smb/client/connect.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-)
diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index dbcaaa274abdb..198681d14153e 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -1884,9 +1884,8 @@ cifs_get_tcp_session(struct smb3_fs_context *ctx, /* 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 (ctx->dfs_root_ses != ses->dfs_root_ses) return 0; @@ -1898,11 +1897,20 @@ 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) {