linux-kernel - [PATCH] bfa: avoid buffer overrun for 12-byte model name

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Date:	Mon, 20 Aug 2012 18:55:23 +0200
From:	Jim Meyering <jim@...ering.net>
To:	linux-kernel@...r.kernel.org
Cc:	Jim Meyering <meyering@...hat.com>,
	Jing Huang <huangj@...cade.com>,
	Krishna C Gudipati <kgudipat@...cade.com>,
	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org
Subject: [PATCH] bfa: avoid buffer overrun for 12-byte model name

From: Jim Meyering <meyering@...hat.com>

we use strncpy to copy a model name of length up to 15 (16, if you count
the NUL), into a buffer of size 12 (BFA_FCS_PORT_SYMBNAME_MODEL_SZ).
However, strncpy does not always NUL-terminate, so whenever the original
model string has strlen >= 12, the following strncat reads beyond end
of the ->sym_name buffer as it attempts to find end of string.

bfa_fcs_fabric_psymb_init(struct bfa_fcs_fabric_s *fabric)
{
	bfa_ioc_get_adapter_model(&fabric->fcs->bfa->ioc, model);
	...
	strncpy((char *)&port_cfg->sym_name, model,
		BFA_FCS_PORT_SYMBNAME_MODEL_SZ);
	strncat((char *)&port_cfg->sym_name, BFA_FCS_PORT_SYMBNAME_SEPARATOR,
		sizeof(BFA_FCS_PORT_SYMBNAME_SEPARATOR));
	...

bfa_ioc_get_adapter_model(struct bfa_ioc_s *ioc, char *model)
{
	struct bfi_ioc_attr_s	*ioc_attr;

	WARN_ON(!model);
	memset((void *)model, 0, BFA_ADAPTER_MODEL_NAME_LEN);

BFA_ADAPTER_MODEL_NAME_LEN = 16

Signed-off-by: Jim Meyering <meyering@...hat.com>
---
 drivers/scsi/bfa/bfa_fcs.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/scsi/bfa/bfa_fcs.c b/drivers/scsi/bfa/bfa_fcs.c
index eaac57e..3329493 100644
--- a/drivers/scsi/bfa/bfa_fcs.c
+++ b/drivers/scsi/bfa/bfa_fcs.c
@@ -713,6 +713,7 @@ bfa_fcs_fabric_psymb_init(struct bfa_fcs_fabric_s *fabric)
 	/* Model name/number */
 	strncpy((char *)&port_cfg->sym_name, model,
 		BFA_FCS_PORT_SYMBNAME_MODEL_SZ);
+	port_cfg->sym_name[BFA_FCS_PORT_SYMBNAME_MODEL_SZ - 1] = 0;
 	strncat((char *)&port_cfg->sym_name, BFA_FCS_PORT_SYMBNAME_SEPARATOR,
 		sizeof(BFA_FCS_PORT_SYMBNAME_SEPARATOR));

-- 
1.7.12

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