linux-kernel - [PATCH v2] cxgb3: remove VLA usage

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Date:   Wed, 7 Mar 2018 12:03:33 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     David Miller <davem@...emloft.net>,
        Santosh Raspatur <santosh@...lsio.com>
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH v2] cxgb3: remove VLA usage

Remove VLA usage and change the 'len' argument to a u8 and use a 256
byte buffer on the stack. Notice that these lengths are limited by the
encoding field in the VPD structure, which is a u8 [1].

[1] https://marc.info/?l=linux-netdev&m=152044354814024&w=2

Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
Changes in v2:
 - Update the code as suggested by David Miller.
 - Update changelog based on David's comments.
 - Update subject.

 drivers/net/ethernet/chelsio/cxgb3/t3_hw.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/chelsio/cxgb3/t3_hw.c b/drivers/net/ethernet/chelsio/cxgb3/t3_hw.c
index a89721f..080918a 100644
--- a/drivers/net/ethernet/chelsio/cxgb3/t3_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/t3_hw.c
@@ -681,18 +681,18 @@ int t3_seeprom_wp(struct adapter *adapter, int enable)
 	return t3_seeprom_write(adapter, EEPROM_STAT_ADDR, enable ? 0xc : 0);
 }
 
-static int vpdstrtouint(char *s, int len, unsigned int base, unsigned int *val)
+static int vpdstrtouint(char *s, u8 len, unsigned int base, unsigned int *val)
 {
-	char tok[len + 1];
+	char tok[256];
 
 	memcpy(tok, s, len);
 	tok[len] = 0;
 	return kstrtouint(strim(tok), base, val);
 }
 
-static int vpdstrtou16(char *s, int len, unsigned int base, u16 *val)
+static int vpdstrtou16(char *s, u8 len, unsigned int base, u16 *val)
 {
-	char tok[len + 1];
+	char tok[256];
 
 	memcpy(tok, s, len);
 	tok[len] = 0;
-- 
2.7.4