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authorDan Rosenberg <drosenberg@vsecurity.com>2010-11-17 06:37:16 +0000
committerDavid S. Miller <davem@davemloft.net>2010-11-17 12:20:52 -0800
commit218854af84038d828a32f061858b1902ed2beec6 (patch)
treed5c688bc9856b3763e354619ff46ebe20edad891 /net
parent7d98ffd8c2d1da6cec5d84eba42c4aa836a93f85 (diff)
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rds: 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. Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/rds/rdma.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/rds/rdma.c b/net/rds/rdma.c
index 8920f2a8332..4e37c1cbe8b 100644
--- a/net/rds/rdma.c
+++ b/net/rds/rdma.c
@@ -567,7 +567,7 @@ int rds_cmsg_rdma_args(struct rds_sock *rs, struct rds_message *rm,
goto out;
}
- if (args->nr_local > (u64)UINT_MAX) {
+ if (args->nr_local > UIO_MAXIOV) {
ret = -EMSGSIZE;
goto out;
}