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[ Upstream commit 4b4e586 ] This is being used with two quite different flows, one attaches the message to the priv and the other does not. Ensure the message attach is consistently done under the spinlock and ensure that the free on error always detaches the message from the cm_id_priv, also always under lock. This makes read/write to the cm_id_priv->msg consistently locked and consistently NULL'd when the message is freed, even in all error paths. Link: https://lore.kernel.org/r/f692b8c89eecb34fd82244f317e478bea6c97688.1622629024.git.leonro@nvidia.com Signed-off-by: Mark Zhang <markzhang@nvidia.com> Signed-off-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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