[PATCH] crypto_user: Fix out-of-bounds read

[Andy Lutomirski]

This is unlikely to be exploitable for anything except an OOPS.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
---

Notes:
    This is entirely untested, but it looks obviously correct to me.

 crypto/crypto_user.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/crypto/crypto_user.c b/crypto/crypto_user.c
index 1512e41..bc7c4b5 100644
--- a/crypto/crypto_user.c
+++ b/crypto/crypto_user.c
@@ -460,7 +460,7 @@ static int crypto_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
 	int type, err;
 
 	type = nlh->nlmsg_type;
-	if (type > CRYPTO_MSG_MAX)
+	if (type < CRYPTO_MSG_BASE || type > CRYPTO_MSG_MAX)
 		return -EINVAL;
 
 	type -= CRYPTO_MSG_BASE;
-- 
1.9.0

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