RDMA/rxe: Fix UAF in ODP init error-handling path

Browse source

rxe_odp_mr_init_user() stores &umem_odp->umem in mr->umem before
calling rxe_odp_init_pages(). If rxe_odp_init_pages() fails,
rxe_odp_mr_init_user() releases umem_odp and returns an error.

rxe_reg_user_mr() then unwinds the error through rxe_cleanup(),
rxe_mr_cleanup(), ib_umem_release(mr->umem). There is an
IS_ERR_OR_NULL(umem) check at the start of ib_umem_release().
But since mr->umem is NOT reset to NULL in the error handling
path of rxe_odp_mr_init_user(), the check passes and it reads
already-freed fields like umem->is_dmabuf, causing UAF.

Fix the UAF by clearing mr->umem after releasing the failed
ODP umem so the MR cleanup path does not release it again.

Fixes: d03fb5c659 ("RDMA/rxe: Allow registering MRs for On-Demand Paging")
Assisted-by: Codex:gpt-5.6-sol
Signed-off-by: Peiyang He <peiyang_he@smail.nju.edu.cn>
Link: https://patch.msgid.link/70CB6DBCB19624C7+20260727050659.1543627-1-peiyang_he@smail.nju.edu.cn
Signed-off-by: Leon Romanovsky <leon@kernel.org>

...

This commit is contained in:

Peiyang He 2026-07-27 13:06:59 +08:00 • committed by Leon Romanovsky

parent a1c0d4719b

commit 51f2c8d2c9

1 changed files with 1 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

1

drivers/infiniband/sw/rxe/rxe_odp.c

View file