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sunrpc: Fix reserved port range calculation

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The range calculation for choosing the random reserved port will panic
with divide-by-zero when min_resvport == max_resvport, a range of one
port, not zero.

Fix the reserved port range calculation by adding one to the difference.

Signed-off-by: Frank Sorenson <sorenson@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Frank Sorenson 2016-07-08 16:35:23 -05:00 committed by Trond Myklebust
parent 34ae685cb3
commit 5d71899a26
1 changed files with 1 additions and 1 deletions
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2
net/sunrpc/xprtsock.c
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@ -1714,7 +1714,7 @@ static void xs_udp_timer(struct rpc_xprt *xprt, struct rpc_task *task)
static unsigned short xs_get_random_port(void) static unsigned short xs_get_random_port(void)
{ {
unsigned short range = xprt_max_resvport - xprt_min_resvport; unsigned short range = xprt_max_resvport - xprt_min_resvport + 1;
unsigned short rand = (unsigned short) prandom_u32() % range; unsigned short rand = (unsigned short) prandom_u32() % range;
return rand + xprt_min_resvport; return rand + xprt_min_resvport;
} }