rds: rds_msg_zcopy should return error of null rm->data.op_mmp_znotifier
if either or both of MSG_ZEROCOPY and SOCK_ZEROCOPY have not been
specified, the rm->data.op_mmp_znotifier allocation will be skipped.
In this case, it is invalid ot pass down a cmsghdr with
RDS_CMSG_ZCOPY_COOKIE, so return EINVAL from rds_msg_zcopy for this
case.
Reported-by: syzbot+f893ae7bb2f6456dfbc3@syzkaller.appspotmail.com
Fixes: 0cebaccef3
("rds: zerocopy Tx support.")
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
9dbe7896d9
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@ -941,7 +941,8 @@ static int rds_cmsg_zcopy(struct rds_sock *rs, struct rds_message *rm,
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{
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u32 *cookie;
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if (cmsg->cmsg_len < CMSG_LEN(sizeof(*cookie)))
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if (cmsg->cmsg_len < CMSG_LEN(sizeof(*cookie)) ||
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!rm->data.op_mmp_znotifier)
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return -EINVAL;
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cookie = CMSG_DATA(cmsg);
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rm->data.op_mmp_znotifier->z_cookie = *cookie;
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