----- Original Message -----
> From: gre...@linuxfoundation.org
> To: broo...@opensource.wolfsonmicro.com
> Cc: stable@vger.kernel.org
> Sent: Wednesday, January 9, 2013 4:50:34 AM
> Subject: FAILED: patch "[PATCH] regmap: debugfs: Avoid overflows for very
> small reads" failed to apply to 3.7-stable
> tree
>
>
> The patch below does not apply to the 3.7-stable tree.
> If someone wants it applied there, or to any other stable or longterm
> tree, then please email the backport, including the original git
> commit
> id to <stable@vger.kernel.org>.
I'll working on this too.
>
> thanks,
>
> greg k-h
>
> ------------------ original commit in Linus's tree ------------------
>
> From db04328c167ff8e7c57f4a3532214aeada3a82fd Mon Sep 17 00:00:00
> 2001
> From: Mark Brown <broo...@opensource.wolfsonmicro.com>
> Date: Tue, 11 Dec 2012 01:14:11 +0900
> Subject: [PATCH] regmap: debugfs: Avoid overflows for very small
> reads
>
> If count is less than the size of a register then we may hit integer
> wraparound when trying to move backwards to check if we're still in
> the buffer. Instead move the position forwards to check if it's still
> in the buffer, we are unlikely to be able to allocate a buffer
> sufficiently big to overflow here.
>
> Signed-off-by: Mark Brown <broo...@opensource.wolfsonmicro.com>
> Cc: stable@vger.kernel.org
>
> diff --git a/drivers/base/regmap/regmap-debugfs.c
> b/drivers/base/regmap/regmap-debugfs.c
> index 00fbd58..3df274e 100644
> --- a/drivers/base/regmap/regmap-debugfs.c
> +++ b/drivers/base/regmap/regmap-debugfs.c
> @@ -93,7 +93,7 @@ static ssize_t regmap_read_debugfs(struct regmap
> *map, unsigned int from,
> /* If we're in the region the user is trying to read */
> if (p >= *ppos) {
> /* ...but not beyond it */
> - if (buf_pos >= count - 1 - map->debugfs_tot_len)
> + if (buf_pos + 1 + map->debugfs_tot_len >= count)
> break;
>
> /* Format the register */
>
> --
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