[patch 10/14] mtd: nand: don't walk past end of oobfree[]

[akpm at linux-foundation.org]

From: David Brownell <dbrownell at users.sourceforge.net>

Resolve issue noted by Sneha: when computing oobavail from the list of
free areas in the OOB, don't assume there will always be an unused slot at
the end.  With ECC_HW_SYNDROME and 4KB page chips, it's fairly likely
there *won't* be one.

Signed-off-by: David Brownell <dbrownell at users.sourceforge.net>
Cc: "Narnakaje, Snehaprabha" <nsnehaprabha at ti.com>"
Cc: David Woodhouse <dwmw2 at infradead.org>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
---

 drivers/mtd/nand/nand_base.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN drivers/mtd/nand/nand_base.c~mtd-nand-dont-walk-past-end-of-oobfree drivers/mtd/nand/nand_base.c
--- a/drivers/mtd/nand/nand_base.c~mtd-nand-dont-walk-past-end-of-oobfree
+++ a/drivers/mtd/nand/nand_base.c
@@ -2756,7 +2756,8 @@ int nand_scan_tail(struct mtd_info *mtd)
 	 * the out of band area
 	 */
 	chip->ecc.layout->oobavail = 0;
-	for (i = 0; chip->ecc.layout->oobfree[i].length; i++)
+	for (i = 0; chip->ecc.layout->oobfree[i].length
+			&& i < ARRAY_SIZE(chip->ecc.layout->oobfree); i++)
 		chip->ecc.layout->oobavail +=
 			chip->ecc.layout->oobfree[i].length;
 	mtd->oobavail = chip->ecc.layout->oobavail;
_