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@xxxxxxxxxx> --- 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
