scsi: arcmsr: Simplify user_len checking

Do the user_len check first and then the ver_addr allocation so that we
can save us the kfree() on the error path when user_len is >
ARCMSR_API_DATA_BUFLEN.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Marco Grassi <marco.gra@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Tomas Henzl <thenzl@redhat.com>
Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: <stable@vger.kernel.org>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 8 insertions, 6 deletions

diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
index 110eca9eaca0..3d53d636b17b 100644
--- a/drivers/scsi/arcmsr/arcmsr_hba.c
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c
@@ -2391,18 +2391,20 @@ static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb,
                 uint32_t user_len;
                 int32_t cnt2end;
                 uint8_t *pQbuffer, *ptmpuserbuffer;
-                ver_addr = kmalloc(ARCMSR_API_DATA_BUFLEN, GFP_ATOMIC);
-                if (!ver_addr) {
+
+                user_len = pcmdmessagefld->cmdmessage.Length;
+                if (user_len > ARCMSR_API_DATA_BUFLEN) {
                         retvalue = ARCMSR_MESSAGE_FAIL;
                         goto message_out;
                 }
-                ptmpuserbuffer = ver_addr;
-                user_len = pcmdmessagefld->cmdmessage.Length;
-                if (user_len > ARCMSR_API_DATA_BUFLEN) {
+
+                ver_addr = kmalloc(ARCMSR_API_DATA_BUFLEN, GFP_ATOMIC);
+                if (!ver_addr) {
                         retvalue = ARCMSR_MESSAGE_FAIL;
-                        kfree(ver_addr);
                         goto message_out;
                 }
+                ptmpuserbuffer = ver_addr;
+
                 memcpy(ptmpuserbuffer,
                         pcmdmessagefld->messagedatabuffer, user_len);
                 spin_lock_irqsave(&acb->wqbuffer_lock, flags);