diff options
| author | Szymon Heidrich | 2022-01-24 12:14:00 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2022-02-11 10:59:12 +0100 |
| commit | 75e5b4849b81e19e9efe1654b30d7f3151c33c2c (patch) | |
| tree | 4fce51754f077d11690321fb886a0c953c986e7b | |
| parent | c853685d11c09da35cb49bbf8f0c001abdc0d0a9 (diff) | |
USB: gadget: validate interface OS descriptor requests
Stall the control endpoint in case provided index exceeds array size of
MAX_CONFIG_INTERFACES or when the retrieved function pointer is null.
Signed-off-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/gadget/composite.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 16f9e3423c9f..9315313108c9 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -1988,6 +1988,9 @@ unknown: if (w_index != 0x5 || (w_value >> 8)) break; interface = w_value & 0xFF; + if (interface >= MAX_CONFIG_INTERFACES || + !os_desc_cfg->interface[interface]) + break; buf[6] = w_index; count = count_ext_prop(os_desc_cfg, interface); |