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-rw-r--r--fs/nfs/super.c284
1 files changed, 77 insertions, 207 deletions
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index d3286583009a..2b8e9a5e366a 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -1008,6 +1008,27 @@ static int nfs_parse_security_flavors(char *value,
return 1;
}
+static int nfs_get_option_str(substring_t args[], char **option)
+{
+ kfree(*option);
+ *option = match_strdup(args);
+ return !option;
+}
+
+static int nfs_get_option_ul(substring_t args[], unsigned long *option)
+{
+ int rc;
+ char *string;
+
+ string = match_strdup(args);
+ if (string == NULL)
+ return -ENOMEM;
+ rc = strict_strtoul(string, 10, option);
+ kfree(string);
+
+ return rc;
+}
+
/*
* Error-check and convert a string of mount options from user space into
* a data structure. The whole mount string is processed; bad options are
@@ -1156,155 +1177,82 @@ static int nfs_parse_mount_options(char *raw,
* options that take numeric values
*/
case Opt_port:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 || option > USHRT_MAX)
+ if (nfs_get_option_ul(args, &option) ||
+ option > USHRT_MAX)
goto out_invalid_value;
mnt->nfs_server.port = option;
break;
case Opt_rsize:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->rsize = option;
break;
case Opt_wsize:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->wsize = option;
break;
case Opt_bsize:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->bsize = option;
break;
case Opt_timeo:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 || option == 0)
+ if (nfs_get_option_ul(args, &option) || option == 0)
goto out_invalid_value;
mnt->timeo = option;
break;
case Opt_retrans:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 || option == 0)
+ if (nfs_get_option_ul(args, &option) || option == 0)
goto out_invalid_value;
mnt->retrans = option;
break;
case Opt_acregmin:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acregmin = option;
break;
case Opt_acregmax:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acregmax = option;
break;
case Opt_acdirmin:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acdirmin = option;
break;
case Opt_acdirmax:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acdirmax = option;
break;
case Opt_actimeo:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->acregmin = mnt->acregmax =
mnt->acdirmin = mnt->acdirmax = option;
break;
case Opt_namelen:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
mnt->namlen = option;
break;
case Opt_mountport:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 || option > USHRT_MAX)
+ if (nfs_get_option_ul(args, &option) ||
+ option > USHRT_MAX)
goto out_invalid_value;
mnt->mount_server.port = option;
break;
case Opt_mountvers:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0 ||
+ if (nfs_get_option_ul(args, &option) ||
option < NFS_MNT_VERSION ||
option > NFS_MNT3_VERSION)
goto out_invalid_value;
mnt->mount_server.version = option;
break;
case Opt_nfsvers:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
switch (option) {
case NFS2_VERSION:
@@ -1324,12 +1272,7 @@ static int nfs_parse_mount_options(char *raw,
}
break;
case Opt_minorversion:
- string = match_strdup(args);
- if (string == NULL)
- goto out_nomem;
- rc = strict_strtoul(string, 10, &option);
- kfree(string);
- if (rc != 0)
+ if (nfs_get_option_ul(args, &option))
goto out_invalid_value;
if (option > NFS4_MAX_MINOR_VERSION)
goto out_invalid_value;
@@ -1365,21 +1308,18 @@ static int nfs_parse_mount_options(char *raw,
case Opt_xprt_udp:
mnt->flags &= ~NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_UDP;
- kfree(string);
break;
case Opt_xprt_tcp6:
protofamily = AF_INET6;
case Opt_xprt_tcp:
mnt->flags |= NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_TCP;
- kfree(string);
break;
case Opt_xprt_rdma:
/* vector side protocols to TCP */
mnt->flags |= NFS_MOUNT_TCP;
mnt->nfs_server.protocol = XPRT_TRANSPORT_RDMA;
xprt_load_transport(string);
- kfree(string);
break;
default:
dfprintk(MOUNT, "NFS: unrecognized "
@@ -1387,6 +1327,7 @@ static int nfs_parse_mount_options(char *raw,
kfree(string);
return 0;
}
+ kfree(string);
break;
case Opt_mountproto:
string = match_strdup(args);
@@ -1429,18 +1370,13 @@ static int nfs_parse_mount_options(char *raw,
goto out_invalid_address;
break;
case Opt_clientaddr:
- string = match_strdup(args);
- if (string == NULL)
+ if (nfs_get_option_str(args, &mnt->client_address))
goto out_nomem;
- kfree(mnt->client_address);
- mnt->client_address = string;
break;
case Opt_mounthost:
- string = match_strdup(args);
- if (string == NULL)
+ if (nfs_get_option_str(args,
+ &mnt->mount_server.hostname))
goto out_nomem;
- kfree(mnt->mount_server.hostname);
- mnt->mount_server.hostname = string;
break;
case Opt_mountaddr:
string = match_strdup(args);
@@ -1480,11 +1416,8 @@ static int nfs_parse_mount_options(char *raw,
};
break;
case Opt_fscache_uniq:
- string = match_strdup(args);
- if (string == NULL)
+ if (nfs_get_option_str(args, &mnt->fscache_uniq))
goto out_nomem;
- kfree(mnt->fscache_uniq);
- mnt->fscache_uniq = string;
mnt->options |= NFS_OPTION_FSCACHE;
break;
case Opt_local_lock:
@@ -1694,99 +1627,59 @@ static int nfs_try_mount(struct nfs_parsed_mount_data *args,
return nfs_walk_authlist(args, &request);
}
-static int nfs_parse_simple_hostname(const char *dev_name,
- char **hostname, size_t maxnamlen,
- char **export_path, size_t maxpathlen)
+/*
+ * Split "dev_name" into "hostname:export_path".
+ *
+ * The leftmost colon demarks the split between the server's hostname
+ * and the export path. If the hostname starts with a left square
+ * bracket, then it may contain colons.
+ *
+ * Note: caller frees hostname and export path, even on error.
+ */
+static int nfs_parse_devname(const char *dev_name,
+ char **hostname, size_t maxnamlen,
+ char **export_path, size_t maxpathlen)
{
size_t len;
- char *colon, *comma;
+ char *end;
- colon = strchr(dev_name, ':');
- if (colon == NULL)
- goto out_bad_devname;
-
- len = colon - dev_name;
- if (len > maxnamlen)
- goto out_hostname;
-
- /* N.B. caller will free nfs_server.hostname in all cases */
- *hostname = kstrndup(dev_name, len, GFP_KERNEL);
- if (!*hostname)
- goto out_nomem;
-
- /* kill possible hostname list: not supported */
- comma = strchr(*hostname, ',');
- if (comma != NULL) {
- if (comma == *hostname)
+ /* Is the host name protected with square brakcets? */
+ if (*dev_name == '[') {
+ end = strchr(++dev_name, ']');
+ if (end == NULL || end[1] != ':')
goto out_bad_devname;
- *comma = '\0';
- }
-
- colon++;
- len = strlen(colon);
- if (len > maxpathlen)
- goto out_path;
- *export_path = kstrndup(colon, len, GFP_KERNEL);
- if (!*export_path)
- goto out_nomem;
-
- dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
- return 0;
-
-out_bad_devname:
- dfprintk(MOUNT, "NFS: device name not in host:path format\n");
- return -EINVAL;
-out_nomem:
- dfprintk(MOUNT, "NFS: not enough memory to parse device name\n");
- return -ENOMEM;
-
-out_hostname:
- dfprintk(MOUNT, "NFS: server hostname too long\n");
- return -ENAMETOOLONG;
-
-out_path:
- dfprintk(MOUNT, "NFS: export pathname too long\n");
- return -ENAMETOOLONG;
-}
-
-/*
- * Hostname has square brackets around it because it contains one or
- * more colons. We look for the first closing square bracket, and a
- * colon must follow it.
- */
-static int nfs_parse_protected_hostname(const char *dev_name,
- char **hostname, size_t maxnamlen,
- char **export_path, size_t maxpathlen)
-{
- size_t len;
- char *start, *end;
+ len = end - dev_name;
+ end++;
+ } else {
+ char *comma;
- start = (char *)(dev_name + 1);
+ end = strchr(dev_name, ':');
+ if (end == NULL)
+ goto out_bad_devname;
+ len = end - dev_name;
- end = strchr(start, ']');
- if (end == NULL)
- goto out_bad_devname;
- if (*(end + 1) != ':')
- goto out_bad_devname;
+ /* kill possible hostname list: not supported */
+ comma = strchr(dev_name, ',');
+ if (comma != NULL && comma < end)
+ *comma = 0;
+ }
- len = end - start;
if (len > maxnamlen)
goto out_hostname;
/* N.B. caller will free nfs_server.hostname in all cases */
- *hostname = kstrndup(start, len, GFP_KERNEL);
+ *hostname = kstrndup(dev_name, len, GFP_KERNEL);
if (*hostname == NULL)
goto out_nomem;
-
- end += 2;
- len = strlen(end);
+ len = strlen(++end);
if (len > maxpathlen)
goto out_path;
*export_path = kstrndup(end, len, GFP_KERNEL);
if (!*export_path)
goto out_nomem;
+ dfprintk(MOUNT, "NFS: MNTPATH: '%s'\n", *export_path);
return 0;
out_bad_devname:
@@ -1807,29 +1700,6 @@ out_path:
}
/*
- * Split "dev_name" into "hostname:export_path".
- *
- * The leftmost colon demarks the split between the server's hostname
- * and the export path. If the hostname starts with a left square
- * bracket, then it may contain colons.
- *
- * Note: caller frees hostname and export path, even on error.
- */
-static int nfs_parse_devname(const char *dev_name,
- char **hostname, size_t maxnamlen,
- char **export_path, size_t maxpathlen)
-{
- if (*dev_name == '[')
- return nfs_parse_protected_hostname(dev_name,
- hostname, maxnamlen,
- export_path, maxpathlen);
-
- return nfs_parse_simple_hostname(dev_name,
- hostname, maxnamlen,
- export_path, maxpathlen);
-}
-
-/*
* Validate the NFS2/NFS3 mount data
* - fills in the mount root filehandle
*
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-14 07:45:07 +0000