From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Date: Wed, 23 Sep 2020 11:30:17 +0300
> This code uses "skey->keylen" as an memcpy() size and then checks that
> it is valid on the next line. The other problem is that the check has
> a potential integer overflow, it's better to use struct_size() for this.
>
> Fixes: 23700da29b83 ("tipc: add automatic rekeying for encryption key")
> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
> ---
> Hey Kees and Julia,
>
> It would be nice to change tipc_aead_key_size() but I'm not sure how the
> UAPI stuff works. My first attempt at to change it to
>
> return struct_size(key, key, key->keylen);
>
> broke the build. I think you guys used Coccinelle to automatically
> update these calculations. Probably this wasn't updated because you
> didn't want to break the build either?
If it is subject to overflows, the tipc_aead_key_size() helper
shouldn't be used as-is by userspace either.
Right?
Please find a way to fix that inline function instead without breaking
UAPI, thank you.
