net: socket: error on a negative msg_namelen
[ Upstream commit dbb490b96584d4e958533fb637f08b557f505657 ] When copying in a struct msghdr from the user, if the user has set the msg_namelen parameter to a negative value it gets clamped to a valid size due to a comparison between signed and unsigned values. Ensure the syscall errors when the user passes in a negative value. Signed-off-by: Matthew Leach <matthew.leach@arm.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1964,6 +1964,10 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
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{
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if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
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return -EFAULT;
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if (kmsg->msg_namelen < 0)
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return -EINVAL;
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if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
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kmsg->msg_namelen = sizeof(struct sockaddr_storage);
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return 0;
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