From: Paul Moore <pmoore@xxxxxxxxxx>
Date: Mon, 02 Jul 2018 14:20:52 -0400
> -static int ipv6_renew_option(void *ohdr,
> - struct ipv6_opt_hdr __user *newopt, int newoptlen,
> - int inherit,
> - struct ipv6_opt_hdr **hdr,
> - char **p)
> +static void ipv6_renew_option(int renewtype,
> + struct ipv6_opt_hdr **dest,
> + struct ipv6_opt_hdr *old,
> + struct ipv6_opt_hdr *new,
> + int newtype, char **p)
> {
...
> + p += CMSG_ALIGN(ipv6_optlen(*dest));
I don't think this actually advances the pointer in the caller,
you need something like:
*p += CMSG_ALIGN(ipv6_optlen(*dest));
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