include/linux/kfifo.h: fix INIT_KFIFO()

commit 530cd330dc3865e3107304a6e84fdc332aa72f7d upstream.

DECLARE_KFIFO creates a union with a struct kfifo and a buffer array with
size [size + sizeof(struct kfifo)].

INIT_KFIFO then sets the buffer pointer in struct kfifo to point to the
beginning of the buffer array which means that the first call to kfifo_in
will overwrite members of the struct kfifo.

Signed-off-by: David Härdeman <david@hardeman.nu>
Acked-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/linux/kfifo.h b/include/linux/kfifo.h
index ece0b1c33816..e117b1aee69c 100644
--- a/include/linux/kfifo.h
+++ b/include/linux/kfifo.h
@@ -86,7 +86,8 @@ union { \
  */
 #define INIT_KFIFO(name) \
         name = __kfifo_initializer(sizeof(name##kfifo_buffer) - \
-                                sizeof(struct kfifo), name##kfifo_buffer)
+                                sizeof(struct kfifo), \
+                                name##kfifo_buffer + sizeof(struct kfifo))
 
 /**
  * DEFINE_KFIFO - macro to define and initialize a kfifo