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| author |   Christoph Paasch <cpaasch@apple.com> | 2019-03-11 11:41:05 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-03-11 15:36:49 -0700 |
| commit | f2feaefdabb0a6253aa020f65e7388f07a9ed47c (patch) | |
| tree | d79b2b98513771ba6e4460a58cf8d25ae93fcded /sound | |
| parent | net: thunder: fix a potential NULL pointer dereference (diff) | |
| download | linux-dev-f2feaefdabb0a6253aa020f65e7388f07a9ed47c.tar.xz linux-dev-f2feaefdabb0a6253aa020f65e7388f07a9ed47c.zip | |
tcp: Don't access TCP_SKB_CB before initializing it
Since commit eeea10b83a13 ("tcp: add
tcp_v4_fill_cb()/tcp_v4_restore_cb()"), tcp_vX_fill_cb is only called
after tcp_filter(). That means, TCP_SKB_CB(skb)->end_seq still points to
the IP-part of the cb.
We thus should not mock with it, as this can trigger bugs (thanks
syzkaller):
[ 12.349396] ==================================================================
[ 12.350188] BUG: KASAN: slab-out-of-bounds in ip6_datagram_recv_specific_ctl+0x19b3/0x1a20
[ 12.351035] Read of size 1 at addr ffff88006adbc208 by task test_ip6_datagr/1799
Setting end_seq is actually no more necessary in tcp_filter as it gets
initialized later on in tcp_vX_fill_cb.
Cc: Eric Dumazet <edumazet@google.com>
Fixes: eeea10b83a13 ("tcp: add tcp_v4_fill_cb()/tcp_v4_restore_cb()")
Signed-off-by: Christoph Paasch <cpaasch@apple.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'sound')
0 files changed, 0 insertions, 0 deletions