From fffba64ca37e8f06020f89e878f0d76a8e121c4e Mon Sep 17 00:00:00 2001 From: Phil Carmody Date: Fri, 16 Apr 2010 15:00:09 +0300 Subject: [PATCH] mfd: Fix error in wm8400 reg cache access check Accessing num_reg elements in the interval [reg .. reg+num_regs) is permitted if (reg+numregs <= array size), so barf when that excluded upper bound is > array size. The prior -1 would give access to one too many elements. Signed-off-by: Phil Carmody Signed-off-by: Samuel Ortiz --- drivers/mfd/wm8400-core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/mfd/wm8400-core.c b/drivers/mfd/wm8400-core.c index 865ce01..e08aafa 100644 --- a/drivers/mfd/wm8400-core.c +++ b/drivers/mfd/wm8400-core.c @@ -118,7 +118,7 @@ static int wm8400_read(struct wm8400 *wm8400, u8 reg, int num_regs, u16 *dest) { int i, ret = 0; - BUG_ON(reg + num_regs - 1 > ARRAY_SIZE(wm8400->reg_cache)); + BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache)); /* If there are any volatile reads then read back the entire block */ for (i = reg; i < reg + num_regs; i++) @@ -144,7 +144,7 @@ static int wm8400_write(struct wm8400 *wm8400, u8 reg, int num_regs, { int ret, i; - BUG_ON(reg + num_regs - 1 > ARRAY_SIZE(wm8400->reg_cache)); + BUG_ON(reg + num_regs > ARRAY_SIZE(wm8400->reg_cache)); for (i = 0; i < num_regs; i++) { BUG_ON(!reg_data[reg + i].writable); -- 2.7.4