diff mbox series

[4.19,225/425] soc: aspeed: fix a ternary sign expansion bug

Message ID 20210520092138.815562664@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH May 20, 2021, 9:19 a.m. UTC 
From: Dan Carpenter <dan.carpenter@oracle.com>

[ Upstream commit 5ffa828534036348fa90fb3079ccc0972d202c4a ]

The intent here was to return negative error codes but it actually
returns positive values.  The problem is that type promotion with
ternary operations is quite complicated.

"ret" is an int.  "copied" is a u32.  And the snoop_file_read() function
returns long.  What happens is that "ret" is cast to u32 and becomes
positive then it's cast to long and it's still positive.

Fix this by removing the ternary so that "ret" is type promoted directly
to long.

Fixes: 3772e5da4454 ("drivers/misc: Aspeed LPC snoop output using misc chardev")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Patrick Venture <venture@google.com>
Link: https://lore.kernel.org/r/YIE90PSXsMTa2Y8n@mwanda
Link: https://lore.kernel.org/r/20210423000919.1249474-1-joel@jms.id.au'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/misc/aspeed-lpc-snoop.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/misc/aspeed-lpc-snoop.c b/drivers/misc/aspeed-lpc-snoop.c
index b4a776bf44bc..e2cb0b9607d1 100644
--- a/drivers/misc/aspeed-lpc-snoop.c
+++ b/drivers/misc/aspeed-lpc-snoop.c
@@ -99,8 +99,10 @@  static ssize_t snoop_file_read(struct file *file, char __user *buffer,
 			return -EINTR;
 	}
 	ret = kfifo_to_user(&chan->fifo, buffer, count, &copied);
+	if (ret)
+		return ret;
 
-	return ret ? ret : copied;
+	return copied;
 }
 
 static __poll_t snoop_file_poll(struct file *file,