Re: [PATCH net-next] net: fix up truesize of cloned skb in skb_prepare_for_shift()

On Mon, Feb 1, 2021 at 5:04 PM Marco Elver [off-list ref] wrote:

Avoid the assumption that ksize(kmalloc(S)) == ksize(kmalloc(S)): when
cloning an skb, save and restore truesize after pskb_expand_head(). This
can occur if the allocator decides to service an allocation of the same
size differently (e.g. use a different size class, or pass the
allocation on to KFENCE).

Because truesize is used for bookkeeping (such as sk_wmem_queued), a
modified truesize of a cloned skb may result in corrupt bookkeeping and
relevant warnings (such as in sk_stream_kill_queues()).

Link: https://lkml.kernel.org/r/X9JR/J6dMMOy1obu@elver.google.com
Reported-by: syzbot+7b99aafdcc2eedea6178@syzkaller.appspotmail.com
Suggested-by: Eric Dumazet <redacted>
Signed-off-by: Marco Elver <elver@google.com>

Signed-off-by: Eric Dumazet <redacted>