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USB: gadget: validate interface OS descriptor requests

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commit 75e5b4849b upstream.

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>
This commit is contained in:
Szymon Heidrich
2022-01-24 12:14:00 +01:00
committed by Greg Kroah-Hartman
parent 351159167c
commit 22ec100472
1 changed files with 3 additions and 0 deletions
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3
drivers/usb/gadget/composite.c
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@@ -1944,6 +1944,9 @@ 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);