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net/l2tp: Fix reference count leak in l2tp_udp_recv_core
commit9b6ff7eb66
upstream. The reference count leak issue may take place in an error handling path. If both conditions of tunnel->version == L2TP_HDR_VER_3 and the return value of l2tp_v3_ensure_opt_in_linear is nonzero, the function would directly jump to label invalid, without decrementing the reference count of the l2tp_session object session increased earlier by l2tp_tunnel_get_session(). This may result in refcount leaks. Fix this issue by decrease the reference count before jumping to the label invalid. Fixes:4522a70db7
("l2tp: fix reading optional fields of L2TPv3") Signed-off-by: Xiyu Yang <xiyuyang19@fudan.edu.cn> Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn> Signed-off-by: Xin Tan <tanxin.ctf@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 3 additions and 1 deletions
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@ -869,8 +869,10 @@ static int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb)
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}
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if (tunnel->version == L2TP_HDR_VER_3 &&
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l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr))
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l2tp_v3_ensure_opt_in_linear(session, skb, &ptr, &optr)) {
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l2tp_session_dec_refcount(session);
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goto invalid;
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}
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l2tp_recv_common(session, skb, ptr, optr, hdrflags, length);
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l2tp_session_dec_refcount(session);
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