From 1aba1567637b93eee32253b42deaaad381c3175b Mon Sep 17 00:00:00 2001 From: Weston Andros Adamson Date: Tue, 24 Apr 2012 16:50:37 -0400 Subject: [PATCH] nfs4: fix referrals on mounts that use IPv6 addrs All referrals (IPv4 addr, IPv6 addr, and DNS) are broken on mounts of IPv6 addresses, because validation code uses a path that is parsed from the dev_name (":") by splitting on the first colon and colons are used in IPv6 addrs. This patch ignores colons within IPv6 addresses that are escaped by '[' and ']'. Signed-off-by: Weston Andros Adamson Signed-off-by: Trond Myklebust --- fs/nfs/nfs4namespace.c | 30 +++++++++++++++++++++++++++--- 1 file changed, 27 insertions(+), 3 deletions(-) diff --git a/fs/nfs/nfs4namespace.c b/fs/nfs/nfs4namespace.c index 9c8eca315f43..7483a177dc97 100644 --- a/fs/nfs/nfs4namespace.c +++ b/fs/nfs/nfs4namespace.c @@ -51,6 +51,30 @@ Elong: return ERR_PTR(-ENAMETOOLONG); } +/* + * return the path component of ":" + * nfspath - the ":" string + * end - one past the last char that could contain ":" + * returns NULL on failure + */ +static char *nfs_path_component(const char *nfspath, const char *end) +{ + char *p; + + if (*nfspath == '[') { + /* parse [] escaped IPv6 addrs */ + p = strchr(nfspath, ']'); + if (p != NULL && ++p < end && *p == ':') + return p + 1; + } else { + /* otherwise split on first colon */ + p = strchr(nfspath, ':'); + if (p != NULL && p < end) + return p + 1; + } + return NULL; +} + /* * Determine the mount path as a string */ @@ -59,9 +83,9 @@ static char *nfs4_path(struct dentry *dentry, char *buffer, ssize_t buflen) char *limit; char *path = nfs_path(&limit, dentry, buffer, buflen); if (!IS_ERR(path)) { - char *colon = strchr(path, ':'); - if (colon && colon < limit) - path = colon + 1; + char *path_component = nfs_path_component(path, limit); + if (path_component) + return path_component; } return path; } -- 2.20.1