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interconnect: Treat xlate() returning NULL node as an error

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[ Upstream commit ad2ab1297d ]

Currently, if provider->xlate() or provider->xlate_extended()
"successfully" return a NULL node, then of_icc_get_from_provider() won't
consider that an error and will successfully return the NULL node. This
bypasses error handling in of_icc_get_by_index() and leads to NULL
dereferences in path_find().

This could be avoided by ensuring provider callbacks always return an
error for NULL nodes, but it's better to explicitly protect against this
in the common framework.

Fixes: 87e3031b6f ("interconnect: Allow endpoints translation via DT")
Signed-off-by: Mike Tipton <quic_mdtipton@quicinc.com>
Link: https://lore.kernel.org/r/20231025145829.11603-1-quic_mdtipton@quicinc.com
Signed-off-by: Georgi Djakov <djakov@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mike Tipton 2023-10-25 07:58:29 -07:00 committed by Greg Kroah-Hartman
parent cc5eec86a4
commit 505df1c0ab
1 changed files with 3 additions and 0 deletions
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3
drivers/interconnect/core.c
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@ -380,6 +380,9 @@ struct icc_node_data *of_icc_get_from_provider(struct of_phandle_args *spec)
}
mutex_unlock(&icc_lock);
if (!node)
return ERR_PTR(-EINVAL);
if (IS_ERR(node))
return ERR_CAST(node);