[PATCH] dmaengine: avoid non-constant format string

Arnd Bergmann
2024-07-19T10:23:23Z

From: Arnd Bergmann <arnd@arndb.de>

Using an arbitrary string as a printf-style format can be a security
problem if that string contains % characters, as the optionalal
-Wformat-security flag points out:

drivers/dma/dmaengine.c: In function '__dma_async_device_channel_register':
drivers/dma/dmaengine.c:1073:17: error: format not a string literal and no format arguments [-Werror=format-security]
1073 | dev_set_name(&chan->dev->device, name);
| ^~~~~~~~~~~~

Change this newly added instance to use "%s" as the format instead to
pass the actual name.

Fixes: 10b8e0fd3f72 ("dmaengine: add channel device name to channel registration")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/dma/dmaengine.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index c380a4dda77a..c1357d7f3dc6 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -1070,7 +1070,7 @@ static int __dma_async_device_channel_register(struct dma_device *device,
if (!name)
dev_set_name(&chan->dev->device, "dma%dchan%d", device->dev_id, chan->chan_id);
else
- dev_set_name(&chan->dev->device, name);
+ dev_set_name(&chan->dev->device, "%s", name);
rc = device_register(&chan->dev->device);
if (rc)
goto err_out_ida;
--
2.39.2