4.14-stable review patch. If anyone has any objections, please let me know.
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From: Roland Dreier roland@purestorage.com
commit 8435168d50e66fa5eae01852769d20a36f9e5e83 upstream.
Check to make sure that ctx->cm_id->device is set before we use it. Otherwise userspace can trigger a NULL dereference by doing RDMA_USER_CM_CMD_SET_OPTION on an ID that is not bound to a device.
Cc: stable@vger.kernel.org Reported-by: syzbot+a67bc93e14682d92fc2f@syzkaller.appspotmail.com Signed-off-by: Roland Dreier roland@purestorage.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/infiniband/core/ucma.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/infiniband/core/ucma.c +++ b/drivers/infiniband/core/ucma.c @@ -1241,6 +1241,9 @@ static int ucma_set_ib_path(struct ucma_ if (!optlen) return -EINVAL;
+ if (!ctx->cm_id->device) + return -EINVAL; + memset(&sa_path, 0, sizeof(sa_path));
sa_path.rec_type = SA_PATH_REC_TYPE_IB;