[Skiboot] [PATCH v2] flash: fix offset and size parameters check

[Cédric Le Goater]

Copying the flash from the host fails :

	# cat /dev/mtd0 > pnor
	cat: /dev/mtd0: Input/output error

and the kernel logs :

	[ 1357.866996] mtd mtd0: opal_flash_async_op(op=0) failed (rc -1)

It seems that the check on the parameters in the opal_flash_op() routine 
are bit excessive and we fail to write or read the last block. 

Here is a fix below which should be enough to catch an out of bounds
operation.

Signed-off-by: Cédric Le Goater <clg at fr.ibm.com>
---

 Change since V2 :
 
 - kept the check for the overflow condition (J. Kerr)
 
 core/flash.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: skiboot.git/core/flash.c
===================================================================
--- skiboot.git.orig/core/flash.c
+++ skiboot.git/core/flash.c
@@ -312,7 +312,7 @@ static int64_t opal_flash_op(enum flash_
 	}
 
 	if (size >= flash->size || offset >= flash->size
-			|| offset + size >= flash->size) {
+			|| offset + size > flash->size) {
 		rc = OPAL_PARAMETER;
 		goto err;
 	}