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authorAl Viro <viro@zeniv.linux.org.uk>2014-03-14 13:42:45 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-04-01 23:19:15 -0400
commit5d826c847b34de6415b4f1becd88a57ff619af50 (patch)
tree431338c4141bcff1d392f232613841bf1971d99b /fs/proc/namespaces.c
parent4efcc9ffcd4fc53f1f7de539842cdffa1f8e5ecc (diff)
downloadlinux-5d826c847b34de6415b4f1becd88a57ff619af50.tar.bz2
new helper: readlink_copy()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/proc/namespaces.c')
-rw-r--r--fs/proc/namespaces.c14
1 files changed, 4 insertions, 10 deletions
diff --git a/fs/proc/namespaces.c b/fs/proc/namespaces.c
index 9ae46b87470d..89026095f2b5 100644
--- a/fs/proc/namespaces.c
+++ b/fs/proc/namespaces.c
@@ -146,7 +146,7 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
struct task_struct *task;
void *ns;
char name[50];
- int len = -EACCES;
+ int res = -EACCES;
task = get_proc_task(inode);
if (!task)
@@ -155,24 +155,18 @@ static int proc_ns_readlink(struct dentry *dentry, char __user *buffer, int bufl
if (!ptrace_may_access(task, PTRACE_MODE_READ))
goto out_put_task;
- len = -ENOENT;
+ res = -ENOENT;
ns = ns_ops->get(task);
if (!ns)
goto out_put_task;
snprintf(name, sizeof(name), "%s:[%u]", ns_ops->name, ns_ops->inum(ns));
- len = strlen(name);
-
- if (len > buflen)
- len = buflen;
- if (copy_to_user(buffer, name, len))
- len = -EFAULT;
-
+ res = readlink_copy(buffer, buflen, name);
ns_ops->put(ns);
out_put_task:
put_task_struct(task);
out:
- return len;
+ return res;
}
static const struct inode_operations proc_ns_link_inode_operations = {