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RDMA: Fix use-after-free in rxe_queue_cleanup 

On error handling path in rxe_qp_from_init() qp->sq.queue is freed and
then rxe_create_qp() will drop last reference to this object. qp clean up
function will try to free this queue one time and it causes UAF bug.

Fix it by zeroing queue pointer after freeing queue in rxe_qp_from_init().

Fixes: 514aee660d ("RDMA: Globally allocate and release QP memory")
Link: https://lore.kernel.org/r/20211121202239.3129-1-paskripkin@gmail.com
Reported-by: syzbot+aab53008a5adf26abe91@syzkaller.appspotmail.com
Signed-off-by: Pavel Skripkin <paskripkin@gmail.com>
Reviewed-by: Zhu Yanjun <zyjzyj2000@gmail.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
This commit is contained in:
Pavel Skripkin 2021-11-21 23:22:39 +03:00 committed by Jason Gunthorpe
parent 1360572566
commit 84b01721e8
1 changed files with 1 additions and 0 deletions
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1
drivers/infiniband/sw/rxe/rxe_qp.c
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@ -359,6 +359,7 @@ int rxe_qp_from_init(struct rxe_dev *rxe, struct rxe_qp *qp, struct rxe_pd *pd,
err2:
rxe_queue_cleanup(qp->sq.queue);
qp->sq.queue = NULL;
err1:
qp->pd = NULL;
qp->rcq = NULL;