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| author | Geert Uytterhoeven <geert+renesas@glider.be> | 2018-04-10 15:21:45 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-04-25 18:07:17 +0200 |
| commit | d2ffed5185df9d8d9ccd150e4340e3b6f96a8381 (patch) | |
| tree | a3a11243b2bff482034b31415fa485407d2c0ecb /drivers/amba/bus.c | |
| parent | ARM: amba: Fix race condition with driver_override (diff) | |
| download | linux-d2ffed5185df9d8d9ccd150e4340e3b6f96a8381.tar.xz linux-d2ffed5185df9d8d9ccd150e4340e3b6f96a8381.zip | |
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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/amba/bus.c | 3 |
1 files changed, 2 insertions, 1 deletions
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); |