[SERIAL PATCH] 1672/1: Restore sizeof(struct serial_struct)

Patch from SAN People

Patch 2.4.21-rmk1 added a "iomap_base" field to the serial_struct
structure (include/linux/serial.h).

Since that structure is exported to user-space it should be
consistent between revisions of the stable 2.4 kernels.

This patch removes 4 bytes (were "reserved") to restore the size
of the structure.

Without this patch, ioctl(TIOCGSERIAL) will copy_to_user() 4
bytes more than expected and possibly corrupt the application's
stack/heap.

include/linux/serial.h

@@ -49,7 +49,6 @@ struct serial_struct {
 	unsigned short	iomem_reg_shift;
 	unsigned int	port_high;
 	unsigned long	iomap_base;	/* cookie passed into ioremap */
-	int	reserved[1];
 };
 
 /*