This is a note to let you know that I've just added the patch titled
ARM: amba: Don't read past the end of sysfs "driver_override" buffer
to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From d2ffed5185df9d8d9ccd150e4340e3b6f96a8381 Mon Sep 17 00:00:00 2001
From: Geert Uytterhoeven geert+renesas@glider.be Date: Tue, 10 Apr 2018 15:21:45 +0200 Subject: ARM: amba: Don't read past the end of sysfs "driver_override" buffer
When printing the driver_override parameter when it is 4095 and 4094 bytes long, the printing code would access invalid memory because we need count + 1 bytes for printing.
Cfr. commits 4efe874aace57dba ("PCI: Don't read past the end of sysfs "driver_override" buffer") and bf563b01c2895a4b ("driver core: platform: Don't read past the end of "driver_override" buffer").
Fixes: 3cf385713460eb2b ("ARM: 8256/1: driver coamba: add device binding path 'driver_override'") Signed-off-by: Geert Uytterhoeven geert+renesas@glider.be Reviewed-by: Todd Kjos tkjos@google.com Cc: stable stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/amba/bus.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c index c77eb6e65646..8e6ac3031662 100644 --- a/drivers/amba/bus.c +++ b/drivers/amba/bus.c @@ -87,7 +87,8 @@ static ssize_t driver_override_store(struct device *_dev, struct amba_device *dev = to_amba_device(_dev); char *driver_override, *old, *cp;
- if (count > PATH_MAX) + /* We need to keep extra room for a newline */ + if (count >= (PAGE_SIZE - 1)) return -EINVAL;
driver_override = kstrndup(buf, count, GFP_KERNEL);