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RDMA/cma: Fix initialization of next_port

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next_port should be between sysctl_local_port_range[0] and [1].
However, it is initially set to a random value with get_random_bytes().  
If the value is negative when treated as a signed integer, next_port
can end up outside the expected range because of the result of the % 
operator being negative.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Sean Hefty 2007-06-05 09:57:31 -07:00 committed by Roland Dreier
parent 57f01b5339
commit bf2944bd56
1 changed files with 2 additions and 2 deletions
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4
drivers/infiniband/core/cma.c
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@ -2773,8 +2773,8 @@ static int cma_init(void)
int ret;
get_random_bytes(&next_port, sizeof next_port);
next_port = (next_port % (sysctl_local_port_range[1] -
sysctl_local_port_range[0])) +
next_port = ((unsigned int) next_port %
(sysctl_local_port_range[1] - sysctl_local_port_range[0])) +
sysctl_local_port_range[0];
cma_wq = create_singlethread_workqueue("rdma_cm");
if (!cma_wq)