From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Tue, 3 Apr 2018 11:52:22 +0300
Subject: scsi: cxgb4i: silence overflow warning in t4_uld_rx_handler()
Patch-mainline: v4.17-rc1
Git-commit: ccc495efb326d17be3e7790b5aa49b25e239ead7
References: bsc#1097585 bsc#1097586 bsc#1097587 bsc#1097588 bsc#1097583 bsc#1097584
Smatch marks skb->data as untrusted so it complains that there is a
potential overflow here:
drivers/scsi/cxgbi/cxgb4i/cxgb4i.c:2111 t4_uld_rx_handler()
error: buffer overflow 'cxgb4i_cplhandlers' 239 <= 255.
In this case, skb->data comes from the hardware or firmware so it's not
going to overflow unless there is a firmware bug.
[mkp: fixed braces]
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
drivers/scsi/cxgbi/cxgb4i/cxgb4i.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- 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 *handl
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);
- }
+ } else
+ cxgb4i_cplhandlers[opc](cdev, skb);
+
return 0;
nomem:
log_debug(1 << CXGBI_DBG_TOE, "OOM bailing out.\n");