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crypto: user - no parsing of CRYPTO_MSG_GETALG 

The CRYPTO_MSG_GETALG netlink message type provides a buffer to the
kernel to retrieve information from the kernel. The data buffer will not
provide any input and will not be read. Hence the nlmsg_parse is not
applicable to this netlink message type.

This patch fixes the following kernel log message when using this
netlink interface:

netlink: 208 bytes leftover after parsing attributes in process `XXX'.

Patch successfully tested with libkcapi from [1] which uses
CRYPTO_MSG_GETALG to obtain cipher-specific information from the kernel.

[1] http://www.chronox.de/libkcapi.html

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Stephan Mueller 2016-05-16 02:53:36 +02:00 committed by Herbert Xu
parent 1a445e8efa
commit eed1e1afd8
1 changed files with 6 additions and 4 deletions
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10
crypto/crypto_user.c
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@ -516,10 +516,12 @@ static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
return err;
}
err = nlmsg_parse(nlh, crypto_msg_min[type], attrs, CRYPTOCFGA_MAX,
crypto_policy);
if (err < 0)
return err;
if (type != (CRYPTO_MSG_GETALG - CRYPTO_MSG_BASE)) {
err = nlmsg_parse(nlh, crypto_msg_min[type], attrs,
CRYPTOCFGA_MAX, crypto_policy);
if (err < 0)
return err;
}
if (link->doit == NULL)
return -EINVAL;