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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>
This commit is contained in:
Borislav Petkov 2016-09-23 13:22:26 +02:00 committed by Martin K. Petersen
parent 182d3f8430
commit 4bd173c307
1 changed files with 8 additions and 6 deletions
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14
drivers/scsi/arcmsr/arcmsr_hba.c
View File

@ -2391,18 +2391,20 @@ static int arcmsr_iop_message_xfer(struct AdapterControlBlock *acb,
uint32_t user_len;
int32_t cnt2end;
uint8_t *pQbuffer, *ptmpuserbuffer;
user_len = pcmdmessagefld->cmdmessage.Length;
if (user_len > ARCMSR_API_DATA_BUFLEN) {
retvalue = ARCMSR_MESSAGE_FAIL;
goto message_out;
}
ver_addr = kmalloc(ARCMSR_API_DATA_BUFLEN, GFP_ATOMIC);
if (!ver_addr) {
retvalue = ARCMSR_MESSAGE_FAIL;
goto message_out;
}
ptmpuserbuffer = ver_addr;
user_len = pcmdmessagefld->cmdmessage.Length;
if (user_len > ARCMSR_API_DATA_BUFLEN) {
retvalue = ARCMSR_MESSAGE_FAIL;
kfree(ver_addr);
goto message_out;
}
memcpy(ptmpuserbuffer,
pcmdmessagefld->messagedatabuffer, user_len);
spin_lock_irqsave(&acb->wqbuffer_lock, flags);