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netlink: Fix nla_parse_nested_compat() to call nla_parse() directly 

The purpose of nla_parse_nested_compat() is to parse attributes which
contain a struct followed by a stream of nested attributes.  So far,
it called nla_parse_nested() to parse the stream of nested attributes
which was wrong, as nla_parse_nested() expects a container attribute
as data which holds the attribute stream.  It needs to call
nla_parse() directly while pointing at the next possible alignment
point after the struct in the beginning of the attribute.

With this patch, I can no longer reproduce the reported leftover
warnings.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2008-05-22 10:48:59 -07:00 committed by David S. Miller
parent 071f92d059
commit b9a2f2e450
1 changed files with 6 additions and 5 deletions
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11
include/net/netlink.h
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@ -772,12 +772,13 @@ static inline int __nla_parse_nested_compat(struct nlattr *tb[], int maxtype,
const struct nla_policy *policy,
int len)
{
if (nla_len(nla) < len)
int nested_len = nla_len(nla) - NLA_ALIGN(len);
if (nested_len < 0)
return -1;
if (nla_len(nla) >= NLA_ALIGN(len) + sizeof(struct nlattr))
return nla_parse_nested(tb, maxtype,
nla_data(nla) + NLA_ALIGN(len),
policy);
if (nested_len >= nla_attr_size(0))
return nla_parse(tb, maxtype, nla_data(nla) + NLA_ALIGN(len),
nested_len, policy);
memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
return 0;
}