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SubjectRe: [PATCH v3 1/4] ozwpan: Use proper check to prevent heap overflow
On Fri, May 29, 2015 at 01:06:58PM +0200, Jason A. Donenfeld wrote:
> --- a/drivers/staging/ozwpan/ozusbsvc1.c
> +++ b/drivers/staging/ozwpan/ozusbsvc1.c
> @@ -390,10 +390,15 @@ void oz_usb_rx(struct oz_pd *pd, struct oz_elt *elt)
> case OZ_GET_DESC_RSP: {
> struct oz_get_desc_rsp *body =
> (struct oz_get_desc_rsp *)usb_hdr;
> - int data_len = elt->length -
> - sizeof(struct oz_get_desc_rsp) + 1;
> - u16 offs = le16_to_cpu(get_unaligned(&body->offset));
> - u16 total_size =
> + u16 offs, total_size;
> + u8 data_len;
> +
> + if (elt->length < sizeof(struct oz_get_desc_rsp) - 1)
> + break;
> + data_len = elt->length -
> + (sizeof(struct oz_get_desc_rsp) - 1);

Gar... I'm really sorry. I wanted to Ack these and be done but why did
the + 1 change to a - 1? And I had the same question about the other
patch as well.

Sorry for the hassle and thanks for doing this work.

regarsd,
dan carpenter




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