Re: net: non contiguous allocations passed to build_skb

From: Eric Dumazet
Date: Fri Apr 24 2015 - 18:03:05 EST

On Fri, 2015-04-24 at 17:28 -0400, Sasha Levin wrote:
> Hey Eric,
> Your commit 79930f5892e ("net: do not deplete pfmemalloc reserve") assumes that
> build_skb() will only handle contiguous allocations because of the
> virt_to_head_page().
> However, netlink_sendmsg() calls build_skb() with vmalloc()ed memory, causing:

gosh. netlink & vmalloc() striked again.

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