overlayfs: make ovl_cache_entry->name an array instead of pointer

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 5 insertions, 6 deletions

diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index b7d9fb098840..9c9872be2c72 100644
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -18,13 +18,13 @@
 #include "overlayfs.h"
 
 struct ovl_cache_entry {
-        const char *name;
         unsigned int len;
         unsigned int type;
         u64 ino;
         bool is_whiteout;
         struct list_head l_node;
         struct rb_node node;
+        char name[];
 };
 
 struct ovl_dir_cache {
@@ -82,13 +82,12 @@ static struct ovl_cache_entry *ovl_cache_entry_new(const char *name, int len,
                                                    u64 ino, unsigned int d_type)
 {
         struct ovl_cache_entry *p;
+        size_t size = offsetof(struct ovl_cache_entry, name[len + 1]);
 
-        p = kmalloc(sizeof(*p) + len + 1, GFP_KERNEL);
+        p = kmalloc(size, GFP_KERNEL);
         if (p) {
-                char *name_copy = (char *) (p + 1);
-                memcpy(name_copy, name, len);
-                name_copy[len] = '\0';
-                p->name = name_copy;
+                memcpy(p->name, name, len);
+                p->name[len] = '\0';
                 p->len = len;
                 p->type = d_type;
                 p->ino = ino;