Re: [PATCH v2 1/1] RDMA/cma: Fix WARNING in res_to_rt

[Jason Gunthorpe <jgg@nvidia.com>]

On Tue, Aug 11, 2026 at 12:01:23AM +0200, Zhu Yanjun wrote:
> id_priv->cma_dev and bind the associated ib_device to id_priv->id.device.
> If cma_acquire_dev_by_src_ip() returns an error (non-zero status), the ID
> remains unassociated with any RDMA device.
> 
> Previously, rdma_restrack_add(&id_priv->res) was invoked unconditionally
> even when cma_acquire_dev_by_src_ip() failed, passing a resource with a
> NULL dev pointer and triggering the WARN_ON assertion in res_to_rt().
> 
> Fix this by only adding the resource to restrack when acquiring the device
> succeeds.
> 
> Reported-by: syzbot+72eddfbadda3e3928e72@syzkaller.appspotmail.com
> Closes: https://syzkaller.appspot.com/bug?extid=72eddfbadda3e3928e72
> Tested-by: syzbot+72eddfbadda3e3928e72@syzkaller.appspotmail.com
> Fixes: cb5cd0ea4eb3 ("RDMA/core: Add CM to restrack after successful attachment to a device")
> 
> Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev>
> ---
> V1 -> V2: Follow Jason's advice to use if/else to handle this problem.
> ---
>  drivers/infiniband/core/cma.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)

Applied to for-next, thanks

Jason