f2fs: avoid abnormal behavior on broken symlink

When f2fs_symlink was triggered and checkpoint was done before syncing its
link path, f2fs can get broken symlink like "xxx -> \0\0\0".
This incurs abnormal path_walk by VFS.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

1 files changed, 19 insertions, 1 deletions

diff --git a/fs/f2fs/namei.c b/fs/f2fs/namei.c
index 9f0eec4677fe..407dde3d7a92 100644
--- a/fs/f2fs/namei.c
+++ b/fs/f2fs/namei.c
@@ -14,6 +14,7 @@
 #include <linux/sched.h>
 #include <linux/ctype.h>
 #include <linux/dcache.h>
+#include <linux/namei.h>
 
 #include "f2fs.h"
 #include "node.h"
@@ -295,6 +296,23 @@ fail:
         return err;
 }
 
+static void *f2fs_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+        struct page *page;
+
+        page = page_follow_link_light(dentry, nd);
+        if (IS_ERR(page))
+                return page;
+
+        /* this is broken symlink case */
+        if (*nd_get_link(nd) == 0) {
+                kunmap(page);
+                page_cache_release(page);
+                return ERR_PTR(-ENOENT);
+        }
+        return page;
+}
+
 static int f2fs_symlink(struct inode *dir, struct dentry *dentry,
                                         const char *symname)
 {
@@ -790,7 +808,7 @@ const struct inode_operations f2fs_dir_inode_operations = {
 
 const struct inode_operations f2fs_symlink_inode_operations = {
         .readlink       = generic_readlink,
-        .follow_link    = page_follow_link_light,
+        .follow_link    = f2fs_follow_link,
         .put_link       = page_put_link,
         .getattr        = f2fs_getattr,
         .setattr        = f2fs_setattr,