ARM: vexpress: fix device_node refcount leak in vexpress_flags_set()

vexpress_flags_set() obtains a reference to the "arm,vexpress-sysreg"
device node via of_find_compatible_node() and passes it to of_iomap(),
but never calls of_node_put() on it. of_iomap() only reads the node's
reg property to create the mapping and does not take ownership, so the
node reference is leaked. The function runs from the __init SMP prepare
path and caches the mapping in a static, so this is a one-shot leak of a
single refcount during boot, with no functional impact.

The lookup was added to drivers/mfd/vexpress-sysreg.c by the commit
below and later moved here by commit 9b06fc39084e ("ARM: vexpress: Move
vexpress_flags_set() into arch code").

Annotate node with the __free(device_node) cleanup attribute so the
reference is released when it goes out of scope.

Found by static analysis tool CodeQL.

Fixes: 974cc7b93441 ("mfd: vexpress: Define the device as MFD cells")
Assisted-by: LLM codeql
Signed-off-by: Weigang He <geoffreyhe2@gmail.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patch.msgid.link/20260925173252.933705-2-geoffreyhe2@gmail.com
Signed-off-by: Sudeep Holla <sudeep.holla@kernel.org>

0 files changed, 0 insertions, 0 deletions