This is a note to let you know that I've just added the patch titled
interconnect: Treat xlate() returning NULL node as an error
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
interconnect-treat-xlate-returning-null-node-as-an-e.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 8914f0b3ba65461b97b9c696fe0c21e5104fc49d
Author: Mike Tipton <quic_mdtipton@xxxxxxxxxxx>
Date: Wed Oct 25 07:58:29 2023 -0700
interconnect: Treat xlate() returning NULL node as an error
[ Upstream commit ad2ab1297d0c80899125a842bb7a078abfe1e6ce ]
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: 87e3031b6fbd ("interconnect: Allow endpoints translation via DT")
Signed-off-by: Mike Tipton <quic_mdtipton@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20231025145829.11603-1-quic_mdtipton@xxxxxxxxxxx
Signed-off-by: Georgi Djakov <djakov@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/interconnect/core.c b/drivers/interconnect/core.c
index be3fa1ac4261c..8f6dfa6b6e4dc 100644
--- a/drivers/interconnect/core.c
+++ b/drivers/interconnect/core.c
@@ -280,6 +280,9 @@ static struct icc_node *of_icc_get_from_provider(struct of_phandle_args *spec)
}
mutex_unlock(&icc_lock);
+ if (!node)
+ return ERR_PTR(-EINVAL);
+
return node;
}
