From: Kees Cook <keescook@chromium.org>
To: Kalle Valo <kvalo@codeaurora.org>
Cc: Stanislaw Gruszka <sgruszka@redhat.com>,
"David S. Miller" <davem@davemloft.net>,
linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH wireless-drivers] mt76x0: Remove VLA usage
Date: Tue, 7 Aug 2018 15:50:40 -0700 [thread overview]
Message-ID: <20180807225040.GA2164@beast> (raw)
Even with "const" variables, the compiler will generate warnings about
VLA usage. In the quest to remove all VLAs from the kernel[1], this uses
a #define instead of a const to do the array sizing.
[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1RqZWA@mail.gmail.com
Fixes: e87b5039511a ("mt76x0: eeprom files")
Signed-off-by: Kees Cook <keescook@chromium.org>
---
Please include this for the v4.19 merge window. The VLA was introduced
with the new source file (which I also note is missing a SPDX line), so
I'd like to avoid the kernel ever getting released with a VLA here.
---
drivers/net/wireless/mediatek/mt76/mt76x0/eeprom.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/net/wireless/mediatek/mt76/mt76x0/eeprom.c b/drivers/net/wireless/mediatek/mt76/mt76x0/eeprom.c
index 1ecd018f12b8..af2fd6a1bb44 100644
--- a/drivers/net/wireless/mediatek/mt76/mt76x0/eeprom.c
+++ b/drivers/net/wireless/mediatek/mt76/mt76x0/eeprom.c
@@ -81,15 +81,15 @@ mt76x0_efuse_read(struct mt76x0_dev *dev, u16 addr, u8 *data,
return 0;
}
+#define MT_MAP_READS DIV_ROUND_UP(MT_EFUSE_USAGE_MAP_SIZE, 16)
static int
mt76x0_efuse_physical_size_check(struct mt76x0_dev *dev)
{
- const int map_reads = DIV_ROUND_UP(MT_EFUSE_USAGE_MAP_SIZE, 16);
- u8 data[map_reads * 16];
+ u8 data[MT_MAP_READS * 16];
int ret, i;
u32 start = 0, end = 0, cnt_free;
- for (i = 0; i < map_reads; i++) {
+ for (i = 0; i < MT_MAP_READS; i++) {
ret = mt76x0_efuse_read(dev, MT_EE_USAGE_MAP_START + i * 16,
data + i * 16, MT_EE_PHYSICAL_READ);
if (ret)
--
2.17.1
--
Kees Cook
Pixel Security
next reply other threads:[~2018-08-07 22:50 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-07 22:50 Kees Cook [this message]
2018-08-08 4:53 ` [PATCH wireless-drivers] mt76x0: Remove VLA usage Kalle Valo
2018-08-08 9:24 ` Stanislaw Gruszka
2018-08-08 9:46 ` Kalle Valo
2018-08-08 15:41 ` Kees Cook
2018-08-09 10:41 ` Stanislaw Gruszka
2018-08-09 10:51 ` Kalle Valo
2018-08-09 15:09 ` Kalle Valo
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