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| author | Vlad Yasevich <vladislav.yasevich@hp.com> | 2008-09-03 01:02:37 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-09-08 03:20:21 -0700 |
| commit | 6d204e4fe042aafb1e443b08de56b4fa5cf012ca (patch) | |
| tree | 6e376f58260ffb45f296ff5864c1f38797fc6951 | |
| parent | 113de4111795af1245a84368c233f25699999908 (diff) | |
| download | lwn-6d204e4fe042aafb1e443b08de56b4fa5cf012ca.tar.gz lwn-6d204e4fe042aafb1e443b08de56b4fa5cf012ca.zip | |
sctp: fix random memory dereference with SCTP_HMAC_IDENT option.
[ Upstream commit d97240552cd98c4b07322f30f66fd9c3ba4171de ]
The number of identifiers needs to be checked against the option
length. Also, the identifier index provided needs to be verified
to make sure that it doesn't exceed the bounds of the array.
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | net/sctp/auth.c | 3 | ||||
| -rw-r--r-- | net/sctp/socket.c | 6 |
2 files changed, 7 insertions, 2 deletions
diff --git a/net/sctp/auth.c b/net/sctp/auth.c index 1fcb4cf2f4c9..52db5f60daa0 100644 --- a/net/sctp/auth.c +++ b/net/sctp/auth.c @@ -786,6 +786,9 @@ int sctp_auth_ep_set_hmacs(struct sctp_endpoint *ep, for (i = 0; i < hmacs->shmac_num_idents; i++) { id = hmacs->shmac_idents[i]; + if (id > SCTP_AUTH_HMAC_ID_MAX) + return -EOPNOTSUPP; + if (SCTP_AUTH_HMAC_ID_SHA1 == id) has_sha1 = 1; diff --git a/net/sctp/socket.c b/net/sctp/socket.c index 05185c772d25..f8c66d63612b 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -3014,6 +3014,7 @@ static int sctp_setsockopt_hmac_ident(struct sock *sk, int optlen) { struct sctp_hmacalgo *hmacs; + u32 idents; int err; if (!sctp_auth_enable) @@ -3031,8 +3032,9 @@ static int sctp_setsockopt_hmac_ident(struct sock *sk, goto out; } - if (hmacs->shmac_num_idents == 0 || - hmacs->shmac_num_idents > SCTP_AUTH_NUM_HMACS) { + idents = hmacs->shmac_num_idents; + if (idents == 0 || idents > SCTP_AUTH_NUM_HMACS || + (idents * sizeof(u16)) > (optlen - sizeof(struct sctp_hmacalgo))) { err = -EINVAL; goto out; } |