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| author | Phil Carmody <ext-phil.2.carmody@nokia.com> | 2010-04-16 16:00:09 +0400 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2010-05-28 03:37:40 +0400 |
| commit | fffba64ca37e8f06020f89e878f0d76a8e121c4e (patch) | |
| tree | 51d6cd2b044aa6a030d7ec321a67b7cc2574e948 | |
| parent | da1e368032d7ff241b9cf1059fa059d781cfeba7 (diff) | |
| download | linux-fffba64ca37e8f06020f89e878f0d76a8e121c4e.tar.xz | |
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 <ext-phil.2.carmody@nokia.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
| -rw-r--r-- | drivers/mfd/wm8400-core.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/mfd/wm8400-core.c b/drivers/mfd/wm8400-core.c index 865ce013a821..e08aafa663dc 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); |