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Message-Id: <20180409210747.3990-1-labbott@redhat.com>
Date: Mon, 9 Apr 2018 14:07:47 -0700
From: Laura Abbott <labbott@...hat.com>
To: Karsten Keil <isdn@...ux-pingi.de>,
"David S. Miller" <davem@...emloft.net>
Cc: Laura Abbott <labbott@...hat.com>,
Kees Cook <keescook@...omium.org>,
netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
kernel-hardening@...ts.openwall.com
Subject: [PATCH] mISDN: Remove VLAs
There's an ongoing effort to remove VLAs[1] from the kernel to eventually
turn on -Wvla. Remove the VLAs from the mISDN code by switching to using
kstrdup in one place and just using the upper bound in another.
[1] https://lkml.org/lkml/2018/3/7/621
Signed-off-by: Laura Abbott <labbott@...hat.com>
---
drivers/isdn/mISDN/dsp_hwec.c | 8 +++++---
drivers/isdn/mISDN/l1oip_core.c | 2 +-
2 files changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/isdn/mISDN/dsp_hwec.c b/drivers/isdn/mISDN/dsp_hwec.c
index a6e87076acc2..5336bbdbfdc5 100644
--- a/drivers/isdn/mISDN/dsp_hwec.c
+++ b/drivers/isdn/mISDN/dsp_hwec.c
@@ -68,12 +68,12 @@ void dsp_hwec_enable(struct dsp *dsp, const char *arg)
goto _do;
{
- char _dup[len + 1];
char *dup, *tok, *name, *val;
int tmp;
- strcpy(_dup, arg);
- dup = _dup;
+ dup = kstrdup(arg, GFP_ATOMIC);
+ if (!dup)
+ return;
while ((tok = strsep(&dup, ","))) {
if (!strlen(tok))
@@ -89,6 +89,8 @@ void dsp_hwec_enable(struct dsp *dsp, const char *arg)
deftaps = tmp;
}
}
+
+ kfree(dup);
}
_do:
diff --git a/drivers/isdn/mISDN/l1oip_core.c b/drivers/isdn/mISDN/l1oip_core.c
index 21d50e4cc5e1..df594245deca 100644
--- a/drivers/isdn/mISDN/l1oip_core.c
+++ b/drivers/isdn/mISDN/l1oip_core.c
@@ -279,7 +279,7 @@ l1oip_socket_send(struct l1oip *hc, u8 localcodec, u8 channel, u32 chanmask,
u16 timebase, u8 *buf, int len)
{
u8 *p;
- u8 frame[len + 32];
+ u8 frame[L1OIP_MAX_PERFRAME + 32];
struct socket *socket = NULL;
if (debug & DEBUG_L1OIP_MSG)
--
2.14.3
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