4.9-stable review patch. If anyone has any objections, please let me know.
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From: Geert Uytterhoeven geert+renesas@glider.be
commit d2ffed5185df9d8d9ccd150e4340e3b6f96a8381 upstream.
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(-)
--- a/drivers/amba/bus.c +++ b/drivers/amba/bus.c @@ -84,7 +84,8 @@ static ssize_t driver_override_store(str 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);