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authorStephan Mueller <smueller@chronox.de>2016-05-16 03:53:36 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2016-05-31 11:41:47 +0300
commiteed1e1afd8d542d9644534c1b712599b5d680007 (patch)
tree135955503d62c4da95dd5ab2e719802d6751f825 /crypto/crypto_user.c
parent1a445e8efaa4334457c4d1f48a5d1d829b503f0c (diff)
downloadlinux-eed1e1afd8d542d9644534c1b712599b5d680007.tar.xz
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>
Diffstat (limited to 'crypto/crypto_user.c')
-rw-r--r--crypto/crypto_user.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 43fe85f20d57..f71960dea882 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -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;