lkml.org 
[lkml]   [2022]   [Jun]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] media: hdpvr: fix error value returns in hdpvr_read
Date
Error return values are supposed to be negative in hdpvr_read. Most
error returns are currently handled via an unsigned integer "ret". When
setting a negative error value to "ret", the value actually becomes a
large positive value, because "ret" is unsigned. Later on, the "ret"
value is returned. But as ssize_t is a 64-bit signed number, the error
return value stays a large positive integer instead of a negative
integer. This can cause an error value to be interpreted as the read
size, which can cause a buffer overread for applications relying on the
returned size.

Fixes: 9aba42efe85b ("V4L/DVB (11096): V4L2 Driver for the Hauppauge HD PVR usb capture device")
Signed-off-by: Niels Dossche <dossche.niels@gmail.com>
---

Note:
I found this issue using my own-developed static analysis tool to find
inconsistent error return values. As I do not have the necessary
hardware to test, I could not test this patch. I only compile-tested
this on x86-64. I found this issue on v5.19-rc2.
I manually verified the issue report by looking at the code.

drivers/media/usb/hdpvr/hdpvr-video.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/hdpvr/hdpvr-video.c b/drivers/media/usb/hdpvr/hdpvr-video.c
index 60e57e0f1927..fd7d2a9d0449 100644
--- a/drivers/media/usb/hdpvr/hdpvr-video.c
+++ b/drivers/media/usb/hdpvr/hdpvr-video.c
@@ -409,7 +409,7 @@ static ssize_t hdpvr_read(struct file *file, char __user *buffer, size_t count,
struct hdpvr_device *dev = video_drvdata(file);
struct hdpvr_buffer *buf = NULL;
struct urb *urb;
- unsigned int ret = 0;
+ int ret = 0;
int rem, cnt;

if (*pos)
--
2.36.1
\
 
 \ /
  Last update: 2022-06-14 19:50    [W:0.099 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site