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Subject[PATCH] drivers/net/usb/hso.c: prevent reading uninitialized memory
The TIOCGICOUNT device ioctl allows unprivileged users to read 9 bytes
of uninitialized stack memory, because the "reserved" member of the
serial_icounter_struct struct declared on the stack in hso_get_count()
is not altered or zeroed before being copied back to the user. This
patch takes care of it.

Signed-off-by: Dan Rosenberg <>

--- linux- 2010-09-11
19:12:00.000000000 -0400
+++ linux- 2010-09-11 19:15:23.000000000 -0400
@@ -1653,6 +1653,8 @@ static int hso_get_count(struct hso_seri
struct uart_icount cnow;
struct hso_tiocmget *tiocmget = serial->tiocmget;

+ memset(&icount, 0, sizeof(struct serial_icounter_struct));
if (!tiocmget)
return -ENOENT;

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