Patch "staging: vchiq_arm: Avoid NULL ptr deref in vchiq_dump_platform_instances" has been added to the 5.16-stable tree

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This is a note to let you know that I've just added the patch titled

    staging: vchiq_arm: Avoid NULL ptr deref in vchiq_dump_platform_instances

to the 5.16-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:
     staging-vchiq_arm-avoid-null-ptr-deref-in-vchiq_dump.patch
and it can be found in the queue-5.16 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 2af95a8b4900076f330e686f527f596a903ff385
Author: Stefan Wahren <stefan.wahren@xxxxxxxx>
Date:   Sun Jan 23 21:02:21 2022 +0100

    staging: vchiq_arm: Avoid NULL ptr deref in vchiq_dump_platform_instances
    
    [ Upstream commit aa899e686d442c63d50f4d369cc02dbbf0941cb0 ]
    
    vchiq_get_state() can return a NULL pointer. So handle this cases and
    avoid a NULL pointer derefence in vchiq_dump_platform_instances.
    
    Reviewed-by: Nicolas Saenz Julienne <nsaenz@xxxxxxxxxx>
    Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
    Link: https://lore.kernel.org/r/1642968143-19281-17-git-send-email-stefan.wahren@xxxxxxxx
    Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
index b9505bb51f45..de25140159e3 100644
--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c
@@ -1209,6 +1209,9 @@ int vchiq_dump_platform_instances(void *dump_context)
 	int len;
 	int i;
 
+	if (!state)
+		return -ENOTCONN;
+
 	/*
 	 * There is no list of instances, so instead scan all services,
 	 * marking those that have been dumped.



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