[PATCH AUTOSEL 5.18 66/68] cifs: version operations for smb20 unneeded when legacy support disabled

From: Sasha Levin
Date: Tue Jun 07 2022 - 14:54:53 EST


From: Steve French <stfrench@xxxxxxxxxxxxx>

[ Upstream commit 7ef93ffccd55fb0ba000ed16ef6a81cd7dee07b5 ]

We should not be including unused smb20 specific code when legacy
support is disabled (CONFIG_CIFS_ALLOW_INSECURE_LEGACY turned
off). For example smb2_operations and smb2_values aren't used
in that case. Over time we can move more and more SMB1/CIFS and SMB2.0
code into the insecure legacy ifdefs

Reviewed-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
fs/cifs/cifsglob.h | 4 +++-
fs/cifs/smb2ops.c | 7 ++++++-
2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 719d419a0a06..04bdd4412c17 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1929,11 +1929,13 @@ extern mempool_t *cifs_mid_poolp;

/* Operations for different SMB versions */
#define SMB1_VERSION_STRING "1.0"
+#define SMB20_VERSION_STRING "2.0"
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
extern struct smb_version_operations smb1_operations;
extern struct smb_version_values smb1_values;
-#define SMB20_VERSION_STRING "2.0"
extern struct smb_version_operations smb20_operations;
extern struct smb_version_values smb20_values;
+#endif /* CIFS_ALLOW_INSECURE_LEGACY */
#define SMB21_VERSION_STRING "2.1"
extern struct smb_version_operations smb21_operations;
extern struct smb_version_values smb21_values;
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index d6aaeff4a30a..304a3cbd205f 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -4323,11 +4323,13 @@ smb3_set_oplock_level(struct cifsInodeInfo *cinode, __u32 oplock,
}
}

+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
static bool
smb2_is_read_op(__u32 oplock)
{
return oplock == SMB2_OPLOCK_LEVEL_II;
}
+#endif /* CIFS_ALLOW_INSECURE_LEGACY */

static bool
smb21_is_read_op(__u32 oplock)
@@ -5426,7 +5428,7 @@ smb2_make_node(unsigned int xid, struct inode *inode,
return rc;
}

-
+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
struct smb_version_operations smb20_operations = {
.compare_fids = smb2_compare_fids,
.setup_request = smb2_setup_request,
@@ -5525,6 +5527,7 @@ struct smb_version_operations smb20_operations = {
.is_status_io_timeout = smb2_is_status_io_timeout,
.is_network_name_deleted = smb2_is_network_name_deleted,
};
+#endif /* CIFS_ALLOW_INSECURE_LEGACY */

struct smb_version_operations smb21_operations = {
.compare_fids = smb2_compare_fids,
@@ -5856,6 +5859,7 @@ struct smb_version_operations smb311_operations = {
.is_network_name_deleted = smb2_is_network_name_deleted,
};

+#ifdef CONFIG_CIFS_ALLOW_INSECURE_LEGACY
struct smb_version_values smb20_values = {
.version_string = SMB20_VERSION_STRING,
.protocol_id = SMB20_PROT_ID,
@@ -5876,6 +5880,7 @@ struct smb_version_values smb20_values = {
.signing_required = SMB2_NEGOTIATE_SIGNING_REQUIRED,
.create_lease_size = sizeof(struct create_lease),
};
+#endif /* ALLOW_INSECURE_LEGACY */

struct smb_version_values smb21_values = {
.version_string = SMB21_VERSION_STRING,
--
2.35.1