[lvc-project] [PATCH] RDMA/cxgb4: Added NULL check for lookup_atid

[Leon Romanovsky]

On Thu, Sep 12, 2024 at 10:58:39AM -0400, Mikhail Lobanov wrote:
> The lookup_atid() function can return NULL if the ATID is
> invalid or does not exist in the identifier table, which
> could lead to dereferencing a null pointer without a
> check in the `act_establish()` and `act_open_rpl()` functions.
> Add a NULL check to prevent null pointer dereferencing.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: cfdda9d76436 ("RDMA/cxgb4: Add driver for Chelsio T4 RNIC")
> Signed-off-by: Mikhail Lobanov <m.lobanov at rosalinux.ru>
> ---
>  drivers/infiniband/hw/cxgb4/cm.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)

I would say that this is not possible flow, but the check is harmless.

Thanks