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Date: Fri, 24 Sep 2010 09:31:42 -0700 From: Greg KH <gregkh@...e.de> To: linux-kernel@...r.kernel.org, stable@...nel.org Cc: stable-review@...nel.org, torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Dan Rosenberg <dan.j.rosenberg@...il.com>, "David S. Miller" <davem@...emloft.net> Subject: [18/68] drivers/net/usb/hso.c: prevent reading uninitialized memory 2.6.32-stable review patch. If anyone has any objections, please let us know. ------------------ From: Dan Rosenberg <drosenberg@...curity.com> commit 7011e660938fc44ed86319c18a5954e95a82ab3e upstream. Fixed formatting (tabs and line breaks). The TIOCGICOUNT device ioctl allows unprivileged users to read 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 <dan.j.rosenberg@...il.com> Signed-off-by: David S. Miller <davem@...emloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- drivers/net/usb/hso.c | 2 ++ 1 file changed, 2 insertions(+) --- a/drivers/net/usb/hso.c +++ b/drivers/net/usb/hso.c @@ -1634,6 +1634,8 @@ 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; spin_lock_irq(&serial->serial_lock); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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