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authorDavid S. Miller <davem@davemloft.net>2008-06-21 09:04:34 +0400
committerDavid S. Miller <davem@davemloft.net>2008-06-21 09:04:34 +0400
commit735ce972fbc8a65fb17788debd7bbe7b4383cc62 (patch)
treeb047160a720011021b148350e42d8cc020f06a61 /net
parent2645a3c3761ac25498db2e627271016c849c68e1 (diff)
downloadlinux-735ce972fbc8a65fb17788debd7bbe7b4383cc62.tar.xz
sctp: Make sure N * sizeof(union sctp_addr) does not overflow.
As noticed by Gabriel Campana, the kmalloc() length arg passed in by sctp_getsockopt_local_addrs_old() can overflow if ->addr_num is large enough. Therefore, enforce an appropriate limit. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sctp/socket.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index e7e3baf7009e..0dbcde6758ea 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -4401,7 +4401,9 @@ static int sctp_getsockopt_local_addrs_old(struct sock *sk, int len,
if (copy_from_user(&getaddrs, optval, len))
return -EFAULT;
- if (getaddrs.addr_num <= 0) return -EINVAL;
+ if (getaddrs.addr_num <= 0 ||
+ getaddrs.addr_num >= (INT_MAX / sizeof(union sctp_addr)))
+ return -EINVAL;
/*
* For UDP-style sockets, id specifies the association to query.
* If the id field is set to the value '0' then the locally bound