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authorLinus Torvalds <torvalds@linux-foundation.org>2017-02-22 11:44:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-22 11:44:32 -0800
commitb2064617c74f301dab1448f1f9c8dbb3c8021058 (patch)
tree02998695437a023316103256e6c0242e47e4b5eb /fs
parente30aee9e10bb5168579e047f05c3d13d09e23356 (diff)
parent17627157cda13089d8a6c1c2d35acb07334b899c (diff)
downloadlinux-b2064617c74f301dab1448f1f9c8dbb3c8021058.tar.bz2
Merge tag 'driver-core-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core
Pull driver core updates from Greg KH: "Here is the "small" driver core patches for 4.11-rc1. Not much here, some firmware documentation and self-test updates, a debugfs code formatting issue, and a new feature for call_usermodehelper to make it more robust on systems that want to lock it down in a more secure way. All of these have been linux-next for a while now with no reported issues" * tag 'driver-core-4.11-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: kernfs: handle null pointers while printing node name and path Introduce STATIC_USERMODEHELPER to mediate call_usermodehelper() Make static usermode helper binaries constant kmod: make usermodehelper path a const string firmware: revamp firmware documentation selftests: firmware: send expected errors to /dev/null selftests: firmware: only modprobe if driver is missing platform: Print the resource range if device failed to claim kref: prefer atomic_inc_not_zero to atomic_add_unless debugfs: improve formatting of debugfs_real_fops()
Diffstat (limited to 'fs')
-rw-r--r--fs/kernfs/dir.c10
-rw-r--r--fs/nfsd/nfs4layouts.c6
2 files changed, 14 insertions, 2 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index cf4c636ff4da..439b946c4808 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -41,6 +41,9 @@ static bool kernfs_lockdep(struct kernfs_node *kn)
static int kernfs_name_locked(struct kernfs_node *kn, char *buf, size_t buflen)
{
+ if (!kn)
+ return strlcpy(buf, "(null)", buflen);
+
return strlcpy(buf, kn->parent ? kn->name : "/", buflen);
}
@@ -110,6 +113,8 @@ static struct kernfs_node *kernfs_common_ancestor(struct kernfs_node *a,
* kn_to: /n1/n2/n3 [depth=3]
* result: /../..
*
+ * [3] when @kn_to is NULL result will be "(null)"
+ *
* Returns the length of the full path. If the full length is equal to or
* greater than @buflen, @buf contains the truncated path with the trailing
* '\0'. On error, -errno is returned.
@@ -123,6 +128,9 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to,
size_t depth_from, depth_to, len = 0;
int i, j;
+ if (!kn_to)
+ return strlcpy(buf, "(null)", buflen);
+
if (!kn_from)
kn_from = kernfs_root(kn_to)->kn;
@@ -166,6 +174,8 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to,
* similar to strlcpy(). It returns the length of @kn's name and if @buf
* isn't long enough, it's filled upto @buflen-1 and nul terminated.
*
+ * Fills buffer with "(null)" if @kn is NULL.
+ *
* This function can be called from any context.
*/
int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen)
diff --git a/fs/nfsd/nfs4layouts.c b/fs/nfsd/nfs4layouts.c
index 1fc07a9c70e9..e122da696f1b 100644
--- a/fs/nfsd/nfs4layouts.c
+++ b/fs/nfsd/nfs4layouts.c
@@ -614,6 +614,7 @@ nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
{
struct nfs4_client *clp = ls->ls_stid.sc_client;
char addr_str[INET6_ADDRSTRLEN];
+ static char const nfsd_recall_failed[] = "/sbin/nfsd-recall-failed";
static char *envp[] = {
"HOME=/",
"TERM=linux",
@@ -629,12 +630,13 @@ nfsd4_cb_layout_fail(struct nfs4_layout_stateid *ls)
"nfsd: client %s failed to respond to layout recall. "
" Fencing..\n", addr_str);
- argv[0] = "/sbin/nfsd-recall-failed";
+ argv[0] = (char *)nfsd_recall_failed;
argv[1] = addr_str;
argv[2] = ls->ls_file->f_path.mnt->mnt_sb->s_id;
argv[3] = NULL;
- error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
+ error = call_usermodehelper(nfsd_recall_failed, argv, envp,
+ UMH_WAIT_PROC);
if (error) {
printk(KERN_ERR "nfsd: fence failed for client %s: %d!\n",
addr_str, error);