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f77d602124
We have seen multiple NULL dereferences in __inet6_lookup_established()
After analysis, I found that inet6_sk() could be NULL while the
check for sk_family == AF_INET6 was true.
Bug was added in linux-2.6.29 when RCU lookups were introduced in UDP
and TCP stacks.
Once an IPv6 socket, using SLAB_DESTROY_BY_RCU is inserted in a hash
table, we no longer can clear pinet6 field.
This patch extends logic used in commit fcbdf09d96
("net: fix nulls list corruptions in sk_prot_alloc")
TCP/UDP/UDPLite IPv6 protocols provide their own .clear_sk() method
to make sure we do not clear pinet6 field.
At socket clone phase, we do not really care, as cloning the parent (non
NULL) pinet6 is not adding a fatal race.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
40 lines
1.5 KiB
C
40 lines
1.5 KiB
C
#ifndef _UDP6_IMPL_H
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#define _UDP6_IMPL_H
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#include <net/udp.h>
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#include <net/udplite.h>
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#include <net/protocol.h>
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#include <net/addrconf.h>
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#include <net/inet_common.h>
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#include <net/transp_v6.h>
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extern int __udp6_lib_rcv(struct sk_buff *, struct udp_table *, int );
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extern void __udp6_lib_err(struct sk_buff *, struct inet6_skb_parm *,
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u8 , u8 , int , __be32 , struct udp_table *);
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extern int udp_v6_get_port(struct sock *sk, unsigned short snum);
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extern int udpv6_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen);
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extern int udpv6_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, unsigned int optlen);
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#ifdef CONFIG_COMPAT
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extern int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
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char __user *optval, unsigned int optlen);
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extern int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
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char __user *optval, int __user *optlen);
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#endif
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extern int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t len);
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extern int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
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struct msghdr *msg, size_t len,
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int noblock, int flags, int *addr_len);
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extern int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb);
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extern void udpv6_destroy_sock(struct sock *sk);
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extern void udp_v6_clear_sk(struct sock *sk, int size);
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#ifdef CONFIG_PROC_FS
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extern int udp6_seq_show(struct seq_file *seq, void *v);
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#endif
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#endif /* _UDP6_IMPL_H */
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