Varun: Please look at this. Thanks!
> What happened to this one?
>
> regards,
> dan carpenter
>
>
> On Wed, Nov 29, 2017 at 02:42:20PM +0300, Dan Carpenter wrote:
>> The story is that Smatch marks skb->data as untrusted and so it
>> complains about this code:
>>
>> drivers/scsi/cxgbi/cxgb4i/cxgb4i.c:2111 t4_uld_rx_handler()
>> error: buffer overflow 'cxgb4i_cplhandlers' 239 <= 255.
>>
>> I don't know the code very well, but it looks like a reasonable warning
>> message. Let's address it by adding a sanity check to make sure "opc"
>> is within bounds.
>>
>> Fixes: bbc02c7e9d34 ("cxgb4: Add register, message, and FW definitions")
>> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>>
>> diff --git a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
>> index 266eddf17a99..94b2d5660a07 100644
>> --- a/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
>> +++ b/drivers/scsi/cxgbi/cxgb4i/cxgb4i.c
>> @@ -2108,12 +2108,12 @@ static int t4_uld_rx_handler(void *handle, const __be64 *rsp,
>> log_debug(1 << CXGBI_DBG_TOE,
>> "cdev %p, opcode 0x%x(0x%x,0x%x), skb %p.\n",
>> cdev, opc, rpl->ot.opcode_tid, ntohl(rpl->ot.opcode_tid), skb);
>> - if (cxgb4i_cplhandlers[opc])
>> - cxgb4i_cplhandlers[opc](cdev, skb);
>> - else {
>> + if (opc >= ARRAY_SIZE(cxgb4i_cplhandlers) || !cxgb4i_cplhandlers[opc]) {
>> pr_err("No handler for opcode 0x%x.\n", opc);
>> __kfree_skb(skb);
>> + return 0;
>> }
>> + cxgb4i_cplhandlers[opc](cdev, skb);
>> return 0;
>> nomem:
>> log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");
>
>
--
Martin K. Petersen Oracle Linux Engineering
