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-rw-r--r--drivers/scsi/aacraid/aachba.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/aacraid/aachba.c b/drivers/scsi/aacraid/aachba.c
index 0c4e27eb652..f9deab686dc 100644
--- a/drivers/scsi/aacraid/aachba.c
+++ b/drivers/scsi/aacraid/aachba.c
@@ -350,8 +350,9 @@ static void aac_internal_transfer(struct scsi_cmnd *scsicmd, void *data, unsigne
buf = scsicmd->request_buffer;
transfer_len = min(scsicmd->request_bufflen, len + offset);
}
-
- memcpy(buf + offset, data, transfer_len - offset);
+ transfer_len -= offset;
+ if (buf && transfer_len)
+ memcpy(buf + offset, data, transfer_len);
if (scsicmd->use_sg)
kunmap_atomic(buf - sg->offset, KM_IRQ0);