linux-kernel - [PATCH] Drivers: hv: Fix bad pointer dereference in hv_get_partition

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Message-Id: <1743528737-20310-1-git-send-email-nunodasneves@linux.microsoft.com>
Date: Tue,  1 Apr 2025 10:32:17 -0700
From: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
To: linux-hyperv@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	wei.liu@...nel.org
Cc: kys@...rosoft.com,
	haiyangz@...rosoft.com,
	mhklinux@...look.com,
	decui@...rosoft.com,
	Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Subject: [PATCH] Drivers: hv: Fix bad pointer dereference in hv_get_partition_id

'output' is already a pointer to the output argument, it should be
passed directly to hv_do_hypercall() without the '&' operator.

Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>
---
This patch is a fixup for:
e96204e5e96e hyperv: Move hv_current_partition_id to arch-generic code

 drivers/hv/hv_common.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index b3b11be11650..a7d7494feaca 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -307,7 +307,7 @@ void __init hv_get_partition_id(void)
 
 	local_irq_save(flags);
 	output = *this_cpu_ptr(hyperv_pcpu_input_arg);
-	status = hv_do_hypercall(HVCALL_GET_PARTITION_ID, NULL, &output);
+	status = hv_do_hypercall(HVCALL_GET_PARTITION_ID, NULL, output);
 	pt_id = output->partition_id;
 	local_irq_restore(flags);
 
-- 
2.34.1