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ipv4: fib_rules: Fix possible infinite loop in fib_empty_table 

gcc warn this:
net/ipv4/fib_rules.c:203 fib_empty_table() warn:
 always true condition '(id <= 4294967295) => (0-u32max <= u32max)'

'id' is u32, which always not greater than RT_TABLE_MAX
(0xFFFFFFFF), So add a check to break while wrap around.

Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YueHaibing 2018-12-29 14:45:23 +08:00 committed by David S. Miller
parent 178fe94405
commit 58075ff523
1 changed files with 6 additions and 2 deletions
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8
net/ipv4/fib_rules.c
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@ -198,11 +198,15 @@ static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
static struct fib_table *fib_empty_table(struct net *net)
{
u32 id;
u32 id = 1;
for (id = 1; id <= RT_TABLE_MAX; id++)
while (1) {
if (!fib_get_table(net, id))
return fib_new_table(net, id);
if (id++ == RT_TABLE_MAX)
break;
}
return NULL;
}