netdev - [PATCH net-next 3/3] accel/qaic: Pass string literal as format argument of alloc

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Message-Id: <20241011-string-thing-v1-3-acc506568033@kernel.org>
Date: Fri, 11 Oct 2024 10:57:12 +0100
From: Simon Horman <horms@...nel.org>
To: "David S. Miller" <davem@...emloft.net>, 
 Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
 Paolo Abeni <pabeni@...hat.com>
Cc: Woojung Huh <woojung.huh@...rochip.com>, Andrew Lunn <andrew@...n.ch>, 
 Florian Fainelli <f.fainelli@...il.com>, 
 Vladimir Oltean <olteanv@...il.com>, 
 Richard Cochran <richardcochran@...il.com>, 
 Jiawen Wu <jiawenwu@...stnetic.com>, 
 Mengyuan Lou <mengyuanlou@...-swift.com>, 
 Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <ndesaulniers@...gle.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
 Jeffrey Hugo <quic_jhugo@...cinc.com>, 
 Carl Vanderlip <quic_carlv@...cinc.com>, Oded Gabbay <ogabbay@...nel.org>, 
 UNGLinuxDriver@...rochip.com, netdev@...r.kernel.org, llvm@...ts.linux.dev, 
 linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH net-next 3/3] accel/qaic: Pass string literal as format
 argument of alloc_workqueue()

Recently I noticed that both gcc-14 and clang-18 report that passing
a non-string literal as the format argument of alloc_workqueue()
is potentially insecure.

E.g. clang-18 says:

.../qaic_drv.c:61:23: warning: format string is not a string literal (potentially insecure) [-Wformat-security]
   61 |         wq = alloc_workqueue(fmt, WQ_UNBOUND, 0);
      |                              ^~~
.../qaic_drv.c:61:23: note: treat the string as an argument to avoid this
   61 |         wq = alloc_workqueue(fmt, WQ_UNBOUND, 0);
      |                              ^
      |                              "%s",

It is always the case where the contents of fmt is safe to pass as the
format argument. That is, in my understanding, it never contains any
format escape sequences.

But, it seems better to be safe than sorry. And, as a bonus, compiler
output becomes less verbose by addressing this issue as suggested by
clang-18.

Also, change the name of the parameter of qaicm_wq_init from
fmt to name to better reflect it's purpose.

Compile tested only.

Signed-off-by: Simon Horman <horms@...nel.org>
---
 drivers/accel/qaic/qaic_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/accel/qaic/qaic_drv.c b/drivers/accel/qaic/qaic_drv.c
index bf10156c334e..30e6bf7897bd 100644
--- a/drivers/accel/qaic/qaic_drv.c
+++ b/drivers/accel/qaic/qaic_drv.c
@@ -53,12 +53,12 @@ static void qaicm_wq_release(struct drm_device *dev, void *res)
 	destroy_workqueue(wq);
 }

-static struct workqueue_struct *qaicm_wq_init(struct drm_device *dev, const char *fmt)
+static struct workqueue_struct *qaicm_wq_init(struct drm_device *dev, const char *name)
 {
 	struct workqueue_struct *wq;
 	int ret;

-	wq = alloc_workqueue(fmt, WQ_UNBOUND, 0);
+	wq = alloc_workqueue("%s", WQ_UNBOUND, 0, name);
 	if (!wq)
 		return ERR_PTR(-ENOMEM);
 	ret = drmm_add_action_or_reset(dev, qaicm_wq_release, wq);

-- 
2.45.2