[PATCH] Return EINVAL if read size is not multiple of struct size

From: James Lamanna
Date: Mon Nov 08 2004 - 16:37:02 EST

The following is a small patch to return EINVAL when the value given
to read() from an event device is not a multiple of sizeof(struct input_event).

Prior to this patch read() with a size less than sizeof(struct input_event)
would always return 0.
This should probably be marked as an error.

Signed-off by: James Lamanna

--- linux-2.6.9/drivers/input/evdev.c 2004-10-18 14:54:40.000000000 -0700
+++ linux-2.6.9-ev-patch/drivers/input/evdev.c 2004-11-08 12:23:45.495800064 -0800
@@ -183,6 +183,9 @@
if (!list->evdev->exist)
return -ENODEV;

+ if (count % sizeof(struct input_event) != 0)
+ return -EINVAL;
while (list->head != list->tail && retval + sizeof(struct input_event) <= count) {
if (copy_to_user(buffer + retval, list->buffer + list->tail,
sizeof(struct input_event))) return -EFAULT;
James Lamanna
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