From 2cab86bee8e7f353e6ac8c15b3eb906643497644 Mon Sep 17 00:00:00 2001 From: Wei Yongjun Date: Thu, 31 Mar 2011 23:42:55 +0000 Subject: sctp: malloc enough room for asconf-ack chunk Sometime the ASCONF_ACK parameters can equal to the fourfold of ASCONF parameters, this only happend in some special case: ASCONF parameter is : Unrecognized Parameter (4 bytes) ASCONF_ACK parameter should be: Error Cause Indication parameter (8 bytes header) + Error Cause (4 bytes header) + Unrecognized Parameter (4bytes) Four 4bytes Unrecognized Parameters in ASCONF chunk will cause panic. Pid: 0, comm: swapper Not tainted 2.6.38-next+ #22 Bochs Bochs EIP: 0060:[] EFLAGS: 00010246 CPU: 0 EIP is at skb_put+0x60/0x70 EAX: 00000077 EBX: c09060e2 ECX: dec1dc30 EDX: c09469c0 ESI: 00000000 EDI: de3c8d40 EBP: dec1dc58 ESP: dec1dc2c DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068 Process swapper (pid: 0, ti=dec1c000 task=c09aef20 task.ti=c0980000) Stack: c09469c0 e1894fa4 00000044 00000004 de3c8d00 de3c8d00 de3c8d44 de3c8d40 c09060e2 de25dd80 de3c8d40 dec1dc7c e1894fa4 dec1dcb0 00000040 00000004 00000000 00000800 00000004 00000004 dec1dce0 e1895a2b dec1dcb4 de25d960 Call Trace: [] ? sctp_addto_chunk+0x4e/0x89 [sctp] [] sctp_addto_chunk+0x4e/0x89 [sctp] [] sctp_process_asconf+0x32f/0x3d1 [sctp] [] sctp_sf_do_asconf+0xf8/0x173 [sctp] [] sctp_do_sm+0xb8/0x159 [sctp] [] ? sctp_cname+0x0/0x52 [sctp] [] sctp_assoc_bh_rcv+0xac/0xe3 [sctp] [] sctp_inq_push+0x2d/0x30 [sctp] [] sctp_rcv+0x7a7/0x83d [sctp] [] ? ipv4_confirm+0x118/0x125 [] ? nf_iterate+0x34/0x62 [] ? ip_local_deliver_finish+0x0/0x194 [] ? ip_local_deliver_finish+0x0/0x194 [] ip_local_deliver_finish+0xf5/0x194 [] ? ip_local_deliver_finish+0x0/0x194 [] NF_HOOK.clone.1+0x3d/0x44 [] ip_local_deliver+0x3e/0x44 [] ? ip_local_deliver_finish+0x0/0x194 [] ip_rcv_finish+0x29f/0x2c7 [] ? ip_rcv_finish+0x0/0x2c7 [] NF_HOOK.clone.1+0x3d/0x44 [] ip_rcv+0x1f5/0x233 [] ? ip_rcv_finish+0x0/0x2c7 [] __netif_receive_skb+0x310/0x336 [] netif_receive_skb+0x4b/0x51 [] cp_rx_poll+0x1e7/0x29c [8139cp] [] net_rx_action+0x65/0x13a [] __do_softirq+0xa1/0x149 [] ? __do_softirq+0x0/0x149 [] ? irq_exit+0x37/0x72 [] ? do_IRQ+0x81/0x95 [] ? common_interrupt+0x30/0x38 [] ? native_safe_halt+0xa/0xc [] ? default_idle+0x58/0x92 [] ? cpu_idle+0x96/0xb2 [] ? rest_init+0x5d/0x5f [] ? start_kernel+0x34b/0x350 [] ? i386_start_kernel+0xba/0xc1 Signed-off-by: Wei Yongjun Signed-off-by: David S. Miller --- net/sctp/sm_make_chunk.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c index de98665db52..b3434cc7d0c 100644 --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -3106,10 +3106,10 @@ struct sctp_chunk *sctp_process_asconf(struct sctp_association *asoc, /* create an ASCONF_ACK chunk. * Based on the definitions of parameters, we know that the size of - * ASCONF_ACK parameters are less than or equal to the twice of ASCONF + * ASCONF_ACK parameters are less than or equal to the fourfold of ASCONF * parameters. */ - asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 2); + asconf_ack = sctp_make_asconf_ack(asoc, serial, chunk_len * 4); if (!asconf_ack) goto done; -- cgit v1.2.3-70-g09d2