2 files changed, 35 insertions, 16 deletions

diff --git a/kernel/module/internal.h b/kernel/module/internal.h
index dc7b0160c480..c8b7b4dcf782 100644
--- a/kernel/module/internal.h
+++ b/kernel/module/internal.h
@@ -32,6 +32,18 @@
 /* Maximum number of characters written by module_flags() */
 #define MODULE_FLAGS_BUF_SIZE (TAINT_FLAGS_COUNT + 4)
 
+struct kernel_symbol {
+#ifdef CONFIG_HAVE_ARCH_PREL32_RELOCATIONS
+	int value_offset;
+	int name_offset;
+	int namespace_offset;
+#else
+	unsigned long value;
+	const char *name;
+	const char *namespace;
+#endif
+};
+
 extern struct mutex module_mutex;
 extern struct list_head modules;
 
diff --git a/kernel/module/main.c b/kernel/module/main.c
index 834de86ebe35..59b1d067e528 100644
--- a/kernel/module/main.c
+++ b/kernel/module/main.c
@@ -3092,7 +3092,7 @@ static bool idempotent(struct idempotent *u, const void *cookie)
  * remove everybody - which includes ourselves - fill in the return
  * value, and then complete the operation.
  */
-static void idempotent_complete(struct idempotent *u, int ret)
+static int idempotent_complete(struct idempotent *u, int ret)
 {
 	const void *cookie = u->cookie;
 	int hash = hash_ptr(cookie, IDEM_HASH_BITS);
@@ -3109,27 +3109,18 @@ static void idempotent_complete(struct idempotent *u, int ret)
 		complete(&pos->complete);
 	}
 	spin_unlock(&idem_lock);
+	return ret;
 }
 
 static int init_module_from_file(struct file *f, const char __user * uargs, int flags)
 {
-	struct idempotent idem;
 	struct load_info info = { };
 	void *buf = NULL;
-	int len, ret;
-
-	if (!f || !(f->f_mode & FMODE_READ))
-		return -EBADF;
-
-	if (idempotent(&idem, file_inode(f))) {
-		wait_for_completion(&idem.complete);
-		return idem.ret;
-	}
+	int len;
 
 	len = kernel_read_file(f, 0, &buf, INT_MAX, NULL, READING_MODULE);
 	if (len < 0) {
 		mod_stat_inc(&failed_kreads);
-		mod_stat_add_long(len, &invalid_kread_bytes);
 		return len;
 	}
 
@@ -3146,9 +3137,25 @@ static int init_module_from_file(struct file *f, const char __user * uargs, int
 		info.len = len;
 	}
 
-	ret = load_module(&info, uargs, flags);
-	idempotent_complete(&idem, ret);
-	return ret;
+	return load_module(&info, uargs, flags);
+}
+
+static int idempotent_init_module(struct file *f, const char __user * uargs, int flags)
+{
+	struct idempotent idem;
+
+	if (!f || !(f->f_mode & FMODE_READ))
+		return -EBADF;
+
+	/* See if somebody else is doing the operation? */
+	if (idempotent(&idem, file_inode(f))) {
+		wait_for_completion(&idem.complete);
+		return idem.ret;
+	}
+
+	/* Otherwise, we'll do it and complete others */
+	return idempotent_complete(&idem,
+		init_module_from_file(f, uargs, flags));
 }
 
 SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
@@ -3168,7 +3175,7 @@ SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags)
 		return -EINVAL;
 
 	f = fdget(fd);
-	err = init_module_from_file(f.file, uargs, flags);
+	err = idempotent_init_module(f.file, uargs, flags);
 	fdput(f);
 	return err;
 }