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SubjectRe: [patch v2] usb: f_fs: off by one bug in _ffs_func_bind()
Date
On Sat, May 28 2016, Dan Carpenter wrote:
> This loop is supposed to set all the .num[] values to -1 but it's off by
> one so it skips the first element and sets one element past the end of
> the array.
>
> I've cleaned up the loop a little as well.
>
> Fixes: ddf8abd25994 ('USB: f_fs: the FunctionFS driver')
> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>

Acked-by: Michal Nazarewicz <mina86@mina86.com>

> ---
> v2: move the eps_ptr assignment outside the loop.
>
> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
> index 73515d5..d26eb64 100644
> --- a/drivers/usb/gadget/function/f_fs.c
> +++ b/drivers/usb/gadget/function/f_fs.c
> @@ -2729,6 +2729,7 @@ static int _ffs_func_bind(struct usb_configuration *c,
> func->ffs->ss_descs_count;
>
> int fs_len, hs_len, ss_len, ret, i;
> + struct ffs_ep *eps_ptr;
>
> /* Make it a single chunk, less management later on */
> vla_group(d);
> @@ -2777,12 +2778,9 @@ static int _ffs_func_bind(struct usb_configuration *c,
> ffs->raw_descs_length);
>
> memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz);
> - for (ret = ffs->eps_count; ret; --ret) {
> - struct ffs_ep *ptr;
> -
> - ptr = vla_ptr(vlabuf, d, eps);
> - ptr[ret].num = -1;
> - }
> + eps_ptr = vla_ptr(vlabuf, d, eps);
> + for (i = 0; i < ffs->eps_count; i++)
> + eps_ptr[i].num = -1;
>
> /* Save pointers
> * d_eps == vlabuf, func->eps used to kfree vlabuf later

--
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»

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