From 4c1e6b2ce13b154a4a69cee220c98976f4b784df Mon Sep 17 00:00:00 2001 From: Roel Kluin Date: Fri, 18 Sep 2009 12:51:49 -0700 Subject: [PATCH] mtd: lart: Prevent a read from mtd->eraseregions[-1] Signed-off-by: Roel Kluin Signed-off-by: Andrew Morton Signed-off-by: David Woodhouse --- drivers/mtd/devices/lart.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/devices/lart.c b/drivers/mtd/devices/lart.c index 578de1c67bfe..f4359fe7150f 100644 --- a/drivers/mtd/devices/lart.c +++ b/drivers/mtd/devices/lart.c @@ -393,7 +393,8 @@ static int flash_erase (struct mtd_info *mtd,struct erase_info *instr) * erase range is aligned with the erase size which is in * effect here. */ - if (instr->addr & (mtd->eraseregions[i].erasesize - 1)) return (-EINVAL); + if (i < 0 || (instr->addr & (mtd->eraseregions[i].erasesize - 1))) + return -EINVAL; /* Remember the erase region we start on */ first = i; @@ -409,7 +410,8 @@ static int flash_erase (struct mtd_info *mtd,struct erase_info *instr) i--; /* is the end aligned on a block boundary? */ - if ((instr->addr + instr->len) & (mtd->eraseregions[i].erasesize - 1)) return (-EINVAL); + if (i < 0 || ((instr->addr + instr->len) & (mtd->eraseregions[i].erasesize - 1))) + return -EINVAL; addr = instr->addr; len = instr->len;