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| author | Willem de Bruijn <willemb@google.com> | 2019-01-07 16:47:33 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-01-10 09:27:20 -0500 |
| commit | 4a06fa67c4da20148803525151845276cdb995c1 (patch) | |
| tree | fce2609c8420b949997d123cec8aacd178a0cd1d /Kbuild | |
| parent | 0b7959b6257322f7693b08a459c505d4938646f2 (diff) | |
| download | linux-4a06fa67c4da20148803525151845276cdb995c1.tar.bz2 | |
ip: on queued skb use skb_header_pointer instead of pskb_may_pull
Commit 2efd4fca703a ("ip: in cmsg IP(V6)_ORIGDSTADDR call
pskb_may_pull") avoided a read beyond the end of the skb linear
segment by calling pskb_may_pull.
That function can trigger a BUG_ON in pskb_expand_head if the skb is
shared, which it is when when peeking. It can also return ENOMEM.
Avoid both by switching to safer skb_header_pointer.
Fixes: 2efd4fca703a ("ip: in cmsg IP(V6)_ORIGDSTADDR call pskb_may_pull")
Reported-by: syzbot <syzkaller@googlegroups.com>
Suggested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Kbuild')
0 files changed, 0 insertions, 0 deletions