Subject: Re: net: socket: NULL ptr deref in sendmsg

From: Sasha Levin <[email-masked]>
Date: Fri, 25 Jul 2014 16:52:26 -0400

On 07/25/2014 11:23 AM, Andrey Ryabinin wrote:
> After this report there was no usual "Unable to handle kernel NULL pointer dereference"
> and this gave me a clue that address 0 is mapped and contains valid socket address structure in it.

Interesting. Does it mean that all network protocols that check it for being NULL instead of checking
the length are incorrect?

(such as:)

        if (msg->msg_name) {
                DECLARE_SOCKADDR(struct sockaddr_can *, addr, msg->msg_name);

                [...]

Thanks,
Sasha