netdev - Integer overflow in RDS cmsg handling

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Date:	Tue, 16 Nov 2010 16:09:45 -0500
From:	Dan Rosenberg <drosenberg@...curity.com>
To:	andy.grover@...cle.com
Cc:	netdev@...r.kernel.org, security@...nel.org
Subject: Integer overflow in RDS cmsg handling

In rds_cmsg_rdma_args(), the user-provided args->nr_local value is
restricted to less than UINT_MAX.  This seems to need a tighter upper
bound, since the calculation of total iov_size can overflow, resulting
in a small sock_kmalloc() allocation.  This would probably just result
in walking off the heap and crashing when calling rds_rdma_pages() with
a high count value.  If it somehow doesn't crash here, then memory
corruption could occur soon after.

-Dan

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