In the Linux kernel, the following vulnerability has been resolved:
net/rds: fix possible cp null dereference
cp might be null, calling cp->cp_conn would produce null dereference
[Simon Horman adds:]
Analysis:
cp is a parameter of __rds_rdma_map and is not reassigned.
The following call-sites pass a NULL cp argument to __rds_rdma_map()
Prior to the code above, the following assumes that cp may be NULL
(which is indicative, but could itself be unnecessary)
trans_private = rs->rs_transport->get_mr(
sg, nents, rs, &mr->r_key, cp ? cp->cp_conn : NULL,
args->vec.addr, args->vec.bytes,
need_odp ? ODP_ZEROBASED : ODP_NOT_NEEDED);
The code modified by this patch is guarded by IS_ERR(trans_private),
where trans_private is assigned as per the previous point in this analysis.
The only implementation of get_mr that I could locate is rds_ib_get_mr()
which can return an ERR_PTR if the conn (4th) argument is NULL.
ret is set to PTR_ERR(trans_private).
rds_ib_get_mr can return ERR_PTR(-ENODEV) if the conn (4th) argument is NULL.
Thus ret may be -ENODEV in which case the code in question will execute.
Conclusion:
git.kernel.org/stable/c/62fc3357e079a07a22465b9b6ef71bb6ea75ee4b
git.kernel.org/stable/c/6794090c742008c53b344b35b021d4a3093dc50a
git.kernel.org/stable/c/92309bed3c5fbe2ccd4c45056efd42edbd06162d
git.kernel.org/stable/c/bcd46782e2ec3825d10c1552fcb674d491cc09f9
git.kernel.org/stable/c/cbaac2e5488ed54833897264a5ffb2a341a9f196
git.kernel.org/stable/c/cfb786b03b03c5ff38882bee38525eb9987e4d14
git.kernel.org/stable/c/d275de8ea7be3a453629fddae41d4156762e814c
git.kernel.org/stable/c/d49fac38479bfdaec52b3ea274d290c47a294029
lists.debian.org/debian-lts-announce/2024/06/msg00017.html
lists.debian.org/debian-lts-announce/2024/06/msg00020.html