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| author | Daniel Borkmann <dborkman@redhat.com> | 2013-12-31 02:40:50 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-01-16 03:27:11 +0400 |
| commit | 5a5bf44e2b40d72ed94d031ebf43e3670b1d7646 (patch) | |
| tree | 486d2a4914c018037f0f61d8dd29a55ce65b2a84 /net/bridge/br_multicast.c | |
| parent | 86dc6b93ee413a3997b699476fc4dd78d8f35df7 (diff) | |
| download | linux-5a5bf44e2b40d72ed94d031ebf43e3670b1d7646.tar.xz | |
net: llc: fix use after free in llc_ui_recvmsg
[ Upstream commit 4d231b76eef6c4a6bd9c96769e191517765942cb ]
While commit 30a584d944fb fixes datagram interface in LLC, a use
after free bug has been introduced for SOCK_STREAM sockets that do
not make use of MSG_PEEK.
The flow is as follow ...
if (!(flags & MSG_PEEK)) {
...
sk_eat_skb(sk, skb, false);
...
}
...
if (used + offset < skb->len)
continue;
... where sk_eat_skb() calls __kfree_skb(). Therefore, cache
original length and work on skb_len to check partial reads.
Fixes: 30a584d944fb ("[LLX]: SOCK_DGRAM interface fixes")
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Stephen Hemminger <stephen@networkplumber.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/bridge/br_multicast.c')
0 files changed, 0 insertions, 0 deletions