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-rw-r--r--fs/kernfs/dir.c34
-rw-r--r--kernel/cgroup/cgroup-v1.c2
-rw-r--r--kernel/cgroup/cgroup.c4
-rw-r--r--kernel/cgroup/cpuset.c2
4 files changed, 21 insertions, 21 deletions
diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index d23bf7883b08..bce1d7ac95ca 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -127,7 +127,7 @@ static struct kernfs_node *kernfs_common_ancestor(struct kernfs_node *a,
*
* [3] when @kn_to is %NULL result will be "(null)"
*
- * Return: the length of the full path. If the full length is equal to or
+ * Return: the length of the constructed path. If the path would have been
* greater than @buflen, @buf contains the truncated path with the trailing
* '\0'. On error, -errno is returned.
*/
@@ -138,16 +138,17 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to,
struct kernfs_node *kn, *common;
const char parent_str[] = "/..";
size_t depth_from, depth_to, len = 0;
+ ssize_t copied;
int i, j;
if (!kn_to)
- return strlcpy(buf, "(null)", buflen);
+ return strscpy(buf, "(null)", buflen);
if (!kn_from)
kn_from = kernfs_root(kn_to)->kn;
if (kn_from == kn_to)
- return strlcpy(buf, "/", buflen);
+ return strscpy(buf, "/", buflen);
common = kernfs_common_ancestor(kn_from, kn_to);
if (WARN_ON(!common))
@@ -158,18 +159,19 @@ static int kernfs_path_from_node_locked(struct kernfs_node *kn_to,
buf[0] = '\0';
- for (i = 0; i < depth_from; i++)
- len += strlcpy(buf + len, parent_str,
- len < buflen ? buflen - len : 0);
+ for (i = 0; i < depth_from; i++) {
+ copied = strscpy(buf + len, parent_str, buflen - len);
+ if (copied < 0)
+ return copied;
+ len += copied;
+ }
/* Calculate how many bytes we need for the rest */
for (i = depth_to - 1; i >= 0; i--) {
for (kn = kn_to, j = 0; j < i; j++)
kn = kn->parent;
- len += strlcpy(buf + len, "/",
- len < buflen ? buflen - len : 0);
- len += strlcpy(buf + len, kn->name,
- len < buflen ? buflen - len : 0);
+
+ len += scnprintf(buf + len, buflen - len, "/%s", kn->name);
}
return len;
@@ -214,7 +216,7 @@ int kernfs_name(struct kernfs_node *kn, char *buf, size_t buflen)
* path (which includes '..'s) as needed to reach from @from to @to is
* returned.
*
- * Return: the length of the full path. If the full length is equal to or
+ * Return: the length of the constructed path. If the path would have been
* greater than @buflen, @buf contains the truncated path with the trailing
* '\0'. On error, -errno is returned.
*/
@@ -265,12 +267,10 @@ void pr_cont_kernfs_path(struct kernfs_node *kn)
sz = kernfs_path_from_node(kn, NULL, kernfs_pr_cont_buf,
sizeof(kernfs_pr_cont_buf));
if (sz < 0) {
- pr_cont("(error)");
- goto out;
- }
-
- if (sz >= sizeof(kernfs_pr_cont_buf)) {
- pr_cont("(name too long)");
+ if (sz == -E2BIG)
+ pr_cont("(name too long)");
+ else
+ pr_cont("(error)");
goto out;
}
diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 76db6c67e39a..9cb00ebe9ac6 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -802,7 +802,7 @@ void cgroup1_release_agent(struct work_struct *work)
goto out_free;
ret = cgroup_path_ns(cgrp, pathbuf, PATH_MAX, &init_cgroup_ns);
- if (ret < 0 || ret >= PATH_MAX)
+ if (ret < 0)
goto out_free;
argv[0] = agentbuf;
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index a844b421fd83..4bc8183b669f 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -1893,7 +1893,7 @@ int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node,
len = kernfs_path_from_node(kf_node, ns_cgroup->kn, buf, PATH_MAX);
spin_unlock_irq(&css_set_lock);
- if (len >= PATH_MAX)
+ if (len == -E2BIG)
len = -ERANGE;
else if (len > 0) {
seq_escape(sf, buf, " \t\n\\");
@@ -6278,7 +6278,7 @@ int proc_cgroup_show(struct seq_file *m, struct pid_namespace *ns,
if (cgroup_on_dfl(cgrp) || !(tsk->flags & PF_EXITING)) {
retval = cgroup_path_ns_locked(cgrp, buf, PATH_MAX,
current->nsproxy->cgroup_ns);
- if (retval >= PATH_MAX)
+ if (retval == -E2BIG)
retval = -ENAMETOOLONG;
if (retval < 0)
goto out_unlock;
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 615daaf87f1f..fb29158ae825 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -4941,7 +4941,7 @@ int proc_cpuset_show(struct seq_file *m, struct pid_namespace *ns,
retval = cgroup_path_ns(css->cgroup, buf, PATH_MAX,
current->nsproxy->cgroup_ns);
css_put(css);
- if (retval >= PATH_MAX)
+ if (retval == -E2BIG)
retval = -ENAMETOOLONG;
if (retval < 0)
goto out_free;