RDMA/cma: Fix deadlock on &lock in rdma_cma_listen_on_all() error unwind

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[ Upstream commit dd37d2f59e ]

rdma_detroy_id() cannot be called under &lock - we must instead keep the
error'd ID around until &lock can be released, then destroy it.

This is complicated by the usual way listen IDs are destroyed through
cma_process_remove() which can run at any time and will asynchronously
destroy the same ID.

Remove the ID from visiblity of cma_process_remove() before going down the
destroy path outside the locking.

Fixes: c80a0c52d8 ("RDMA/cma: Add missing error handling of listen_id")
Link: https://lore.kernel.org/r/20201118133756.GK244516@ziepe.ca
Reported-by: syzbot+1bc48bf7f78253f664a9@syzkaller.appspotmail.com
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Jason Gunthorpe 2020-11-18 09:33:23 -04:00 • committed by Greg Kroah-Hartman

parent 98e72ffe93

commit f85d05c0a5

1 changed files with 18 additions and 7 deletions

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drivers/infiniband/core/cma.c

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