Merge tag 'for-linus-merge-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

Pull v9fs update from Eric Van Hensbergen.

* tag 'for-linus-merge-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  9P: Fix race between p9_write_work() and p9_fd_request()
  9P: Fix race in p9_write_work()
  9P: fix test at the end of p9_write_work()
  9P: Fix race in p9_read_work()
  9p: don't use __getname/__putname for uname/aname
  net/9p: Check errno validity
  fs/9p: avoid debug OOPS when reading a long symlink

2 files changed, 23 insertions, 15 deletions

diff --git a/fs/9p/v9fs.c b/fs/9p/v9fs.c
index 392c5dac1981..d934f04e7736 100644
--- a/fs/9p/v9fs.c
+++ b/fs/9p/v9fs.c
@@ -184,10 +184,20 @@ static int v9fs_parse_options(struct v9fs_session_info *v9ses, char *opts)
                         v9ses->afid = option;
                         break;
                 case Opt_uname:
-                        match_strlcpy(v9ses->uname, &args[0], PATH_MAX);
+                        kfree(v9ses->uname);
+                        v9ses->uname = match_strdup(&args[0]);
+                        if (!v9ses->uname) {
+                                ret = -ENOMEM;
+                                goto free_and_return;
+                        }
                         break;
                 case Opt_remotename:
-                        match_strlcpy(v9ses->aname, &args[0], PATH_MAX);
+                        kfree(v9ses->aname);
+                        v9ses->aname = match_strdup(&args[0]);
+                        if (!v9ses->aname) {
+                                ret = -ENOMEM;
+                                goto free_and_return;
+                        }
                         break;
                 case Opt_nodevmap:
                         v9ses->nodev = 1;
@@ -287,21 +297,21 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
         struct p9_fid *fid;
         int rc;
 
-        v9ses->uname = __getname();
+        v9ses->uname = kstrdup(V9FS_DEFUSER, GFP_KERNEL);
         if (!v9ses->uname)
                 return ERR_PTR(-ENOMEM);
 
-        v9ses->aname = __getname();
+        v9ses->aname = kstrdup(V9FS_DEFANAME, GFP_KERNEL);
         if (!v9ses->aname) {
-                __putname(v9ses->uname);
+                kfree(v9ses->uname);
                 return ERR_PTR(-ENOMEM);
         }
         init_rwsem(&v9ses->rename_sem);
 
         rc = bdi_setup_and_register(&v9ses->bdi, "9p", BDI_CAP_MAP_COPY);
         if (rc) {
-                __putname(v9ses->aname);
-                __putname(v9ses->uname);
+                kfree(v9ses->aname);
+                kfree(v9ses->uname);
                 return ERR_PTR(rc);
         }
 
@@ -309,8 +319,6 @@ struct p9_fid *v9fs_session_init(struct v9fs_session_info *v9ses,
         list_add(&v9ses->slist, &v9fs_sessionlist);
         spin_unlock(&v9fs_sessionlist_lock);
 
-        strcpy(v9ses->uname, V9FS_DEFUSER);
-        strcpy(v9ses->aname, V9FS_DEFANAME);
         v9ses->uid = ~0;
         v9ses->dfltuid = V9FS_DEFUID;
         v9ses->dfltgid = V9FS_DEFGID;
@@ -412,8 +420,8 @@ void v9fs_session_close(struct v9fs_session_info *v9ses)
                 kfree(v9ses->cachetag);
         }
 #endif
-        __putname(v9ses->uname);
-        __putname(v9ses->aname);
+        kfree(v9ses->uname);
+        kfree(v9ses->aname);
 
         bdi_destroy(&v9ses->bdi);
 
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index cbf9dbb1b2a2..890bed538f9b 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -1276,12 +1276,12 @@ static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
         }
 
         /* copy extension buffer into buffer */
-        strncpy(buffer, st->extension, buflen);
+        retval = min(strlen(st->extension)+1, (size_t)buflen);
+        memcpy(buffer, st->extension, retval);
 
-        p9_debug(P9_DEBUG_VFS, "%s -> %s (%s)\n",
-                 dentry->d_name.name, st->extension, buffer);
+        p9_debug(P9_DEBUG_VFS, "%s -> %s (%.*s)\n",
+                 dentry->d_name.name, st->extension, buflen, buffer);
 
-        retval = strnlen(buffer, buflen);
 done:
         p9stat_free(st);
         kfree(st);