new helper: security_sb_eat_lsm_opts()

combination of alloc_secdata(), security_sb_copy_data(),
security_sb_parse_opt_str() and free_secdata().

Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

4 files changed, 5 insertions, 49 deletions

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index b362b45dd7578..6fc8e963ad440 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1461,20 +1461,7 @@ out:
 static int parse_security_options(char *orig_opts,
 				  struct security_mnt_opts *sec_opts)
 {
-	char *secdata = NULL;
-	int ret = 0;
-
-	secdata = alloc_secdata();
-	if (!secdata)
-		return -ENOMEM;
-	ret = security_sb_copy_data(orig_opts, secdata);
-	if (ret) {
-		free_secdata(secdata);
-		return ret;
-	}
-	ret = security_sb_parse_opts_str(secdata, sec_opts);
-	free_secdata(secdata);
-	return ret;
+	return security_sb_eat_lsm_opts(orig_opts, sec_opts);
 }
 
 static int setup_security_options(struct btrfs_fs_info *fs_info,
diff --git a/fs/namespace.c b/fs/namespace.c
index 341793fbd3901..39aca7b69c2e3 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -2312,16 +2312,7 @@ static int do_remount(struct path *path, int ms_flags, int sb_flags,
 
 	security_init_mnt_opts(&opts);
 	if (data && !(sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)) {
-		char *secdata = alloc_secdata();
-		if (!secdata)
-			return -ENOMEM;
-		err = security_sb_copy_data(data, secdata);
-		if (err) {
-			free_secdata(secdata);
-			return err;
-		}
-		err = security_sb_parse_opts_str(secdata, &opts);
-		free_secdata(secdata);
+		err = security_sb_eat_lsm_opts(data, &opts);
 		if (err)
 			return err;
 	}
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index ac4b2f005778c..f9c8847171e8b 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1206,7 +1206,7 @@ static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
 static int nfs_parse_mount_options(char *raw,
 				   struct nfs_parsed_mount_data *mnt)
 {
-	char *p, *string, *secdata;
+	char *p, *string;
 	int rc, sloppy = 0, invalid_option = 0;
 	unsigned short protofamily = AF_UNSPEC;
 	unsigned short mountfamily = AF_UNSPEC;
@@ -1217,20 +1217,10 @@ static int nfs_parse_mount_options(char *raw,
 	}
 	dfprintk(MOUNT, "NFS: nfs mount opts='%s'\n", raw);
 
-	secdata = alloc_secdata();
-	if (!secdata)
-		goto out_nomem;
-
-	rc = security_sb_copy_data(raw, secdata);
-	if (rc)
-		goto out_security_failure;
-
-	rc = security_sb_parse_opts_str(secdata, &mnt->lsm_opts);
+	rc = security_sb_eat_lsm_opts(raw, &mnt->lsm_opts);
 	if (rc)
 		goto out_security_failure;
 
-	free_secdata(secdata);
-
 	while ((p = strsep(&raw, ",")) != NULL) {
 		substring_t args[MAX_OPT_ARGS];
 		unsigned long option;
@@ -1682,7 +1672,6 @@ out_nomem:
 	printk(KERN_INFO "NFS: not enough memory to parse option\n");
 	return 0;
 out_security_failure:
-	free_secdata(secdata);
 	printk(KERN_INFO "NFS: security options invalid: %d\n", rc);
 	return 0;
 }
diff --git a/fs/super.c b/fs/super.c
index 8d9c9199832d7..d571527cb8b8a 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1252,18 +1252,7 @@ mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
 	security_init_mnt_opts(&opts);
 
 	if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) {
-		char *secdata = alloc_secdata();
-		if (!secdata)
-			return ERR_PTR(-ENOMEM);
-
-		error = security_sb_copy_data(data, secdata);
-		if (error) {
-			free_secdata(secdata);
-			return ERR_PTR(error);
-		}
-
-		error = security_sb_parse_opts_str(secdata, &opts);
-		free_secdata(secdata);
+		error = security_sb_eat_lsm_opts(data, &opts);
 		if (error)
 			return ERR_PTR(error);
 	}