4.14-stable review patch. If anyone has any objections, please let me know.
------------------ From: Moni Shoua <[email protected]> commit 05d14e7b0c138cb07ba30e464f47b39434f3fdef upstream. If the input command length is larger than the kernel supports an error should be returned in case the unsupported bytes are not cleared, instead of the other way aroudn. This matches what all other callers of ib_is_udata_cleared do and will avoid user ABI problems in the future. Fixes: 189aba99e700 ("IB/uverbs: Extend modify_qp and support packet pacing") Reviewed-by: Yishai Hadas <[email protected]> Signed-off-by: Moni Shoua <[email protected]> Signed-off-by: Leon Romanovsky <[email protected]> Signed-off-by: Jason Gunthorpe <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/infiniband/core/uverbs_cmd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -2085,8 +2085,8 @@ int ib_uverbs_ex_modify_qp(struct ib_uve return -EOPNOTSUPP; if (ucore->inlen > sizeof(cmd)) { - if (ib_is_udata_cleared(ucore, sizeof(cmd), - ucore->inlen - sizeof(cmd))) + if (!ib_is_udata_cleared(ucore, sizeof(cmd), + ucore->inlen - sizeof(cmd))) return -EOPNOTSUPP; }
