4d231b76ee
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>
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|---|---|---|
| .. | ||
| af_llc.c | ||
| Kconfig | ||
| llc_c_ac.c | ||
| llc_c_ev.c | ||
| llc_c_st.c | ||
| llc_conn.c | ||
| llc_core.c | ||
| llc_if.c | ||
| llc_input.c | ||
| llc_output.c | ||
| llc_pdu.c | ||
| llc_proc.c | ||
| llc_s_ac.c | ||
| llc_s_ev.c | ||
| llc_s_st.c | ||
| llc_sap.c | ||
| llc_station.c | ||
| Makefile | ||
| sysctl_net_llc.c | ||