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Subject: media: hdpvr: fix error value returns in hdpvr_read Author: Niels Dossche <[email protected]> Date: Tue Jun 14 18:50:02 2022 +0100 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 <[email protected]> Signed-off-by: Hans Verkuil <[email protected]> Signed-off-by: Mauro Carvalho Chehab <[email protected]> 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) _______________________________________________ linuxtv-commits mailing list [email protected] https://www.linuxtv.org/cgi-bin/mailman/listinfo/linuxtv-commits
