linux-hardening - [PATCH][next] scsi: storvsc: Use struct_size() helper in storvsc

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Date:   Tue, 25 Jan 2022 13:42:13 -0600
From:   "Gustavo A. R. Silva" <gustavoars@...nel.org>
To:     "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-hyperv@...r.kernel.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        linux-hardening@...r.kernel.org
Subject: [PATCH][next] scsi: storvsc: Use struct_size() helper in
 storvsc_queuecommand()

Make use of the struct_size() helper instead of an open-coded version,
in order to avoid any potential type mistakes or integer overflows that,
in the worst scenario, could lead to heap overflows.

Also, address the following sparse warnings:
drivers/scsi/storvsc_drv.c:1843:39: warning: using sizeof on a flexible structure

Link: https://github.com/KSPP/linux/issues/174
Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org>
---
 drivers/scsi/storvsc_drv.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 9a0bba5a51a7..89c20dfc6609 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1755,7 +1755,7 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
 	struct scatterlist *sgl;
 	struct vmscsi_request *vm_srb;
 	struct vmbus_packet_mpb_array  *payload;
-	u32 payload_sz;
+	size_t payload_sz;
 	u32 length;
 
 	if (vmstor_proto_version <= VMSTOR_PROTO_VERSION_WIN8) {
@@ -1839,8 +1839,8 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
 
 		if (hvpg_count > MAX_PAGE_BUFFER_COUNT) {
 
-			payload_sz = (hvpg_count * sizeof(u64) +
-				      sizeof(struct vmbus_packet_mpb_array));
+			payload_sz = struct_size(payload, range.pfn_array,
+						 hvpg_count);
 			payload = kzalloc(payload_sz, GFP_ATOMIC);
 			if (!payload)
 				return SCSI_MLQUEUE_DEVICE_BUSY;
-- 
2.27.0