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netlink: revert broken, broken "2-clause nla_ok()"

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Commit 4f7df337fe
"netlink: 2-clause nla_ok()" is BROKEN.

First clause tests if "->nla_len" could even be accessed at all,
it can not possibly be omitted.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Dobriyan 2016-12-13 22:30:15 +03:00 committed by David S. Miller
parent a220871be6
commit 3e1ed981b7
1 changed files with 2 additions and 1 deletions
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3
include/net/netlink.h
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@ -698,7 +698,8 @@ static inline int nla_len(const struct nlattr *nla)
*/
static inline int nla_ok(const struct nlattr *nla, int remaining)
{
return nla->nla_len >= sizeof(*nla) &&
return remaining >= (int) sizeof(*nla) &&
nla->nla_len >= sizeof(*nla) &&
nla->nla_len <= remaining;
}