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

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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
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1
drivers/infiniband/sw/rxe/rxe_odp.c
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@ -109,6 +109,7 @@ int rxe_odp_mr_init_user(struct rxe_dev *rxe, u64 start, u64 length,
err = rxe_odp_init_pages(mr);
if (err) {
ib_umem_odp_release(umem_odp);
mr->umem = NULL;
return err;
}