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sctp: fix an array overflow when all ext chunks are set 

Marcelo noticed an array overflow caused by commit c28445c3cb
("sctp: add reconf_enable in asoc ep and netns"), in which sctp
would add SCTP_CID_RECONF into extensions when reconf_enable is
set in sctp_make_init and sctp_make_init_ack.

Then now when all ext chunks are set, 4 ext chunk ids can be put
into extensions array while extensions array size is 3. It would
cause a kernel panic because of this overflow.

This patch is to fix it by defining extensions array size is 4 in
both sctp_make_init and sctp_make_init_ack.

Fixes: c28445c3cb ("sctp: add reconf_enable in asoc ep and netns")
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2017-07-14 22:07:33 +08:00 committed by David S. Miller
parent 56c0da495a
commit 10b3bf5440
1 changed files with 2 additions and 2 deletions
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4
net/sctp/sm_make_chunk.c
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@ -228,7 +228,7 @@ struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
sctp_adaptation_ind_param_t aiparam;
sctp_supported_ext_param_t ext_param;
int num_ext = 0;
__u8 extensions[3];
__u8 extensions[4];
struct sctp_paramhdr *auth_chunks = NULL,
*auth_hmacs = NULL;
@ -396,7 +396,7 @@ struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
sctp_adaptation_ind_param_t aiparam;
sctp_supported_ext_param_t ext_param;
int num_ext = 0;
__u8 extensions[3];
__u8 extensions[4];
struct sctp_paramhdr *auth_chunks = NULL,
*auth_hmacs = NULL,
*auth_random = NULL;