From b2a2ed8dce8f82b9c9ba702872e8157418729c7d Mon Sep 17 00:00:00 2001
From: Frode Isaksen <frode@meta.com>
Date: Thu, 3 Apr 2025 09:28:03 +0200
Subject: [PATCH] UPSTREAM: usb: dwc3: gadget: check that event count does not
 exceed event buffer length

commit 63ccd26cd1f6600421795f6ca3e625076be06c9f upstream.

The event count is read from register DWC3_GEVNTCOUNT.
There is a check for the count being zero, but not for exceeding the
event buffer length.
Check that event count does not exceed event buffer length,
avoiding an out-of-bounds access when memcpy'ing the event.
Crash log:
Unable to handle kernel paging request at virtual address ffffffc0129be000
pc : __memcpy+0x114/0x180
lr : dwc3_check_event_buf+0xec/0x348
x3 : 0000000000000030 x2 : 000000000000dfc4
x1 : ffffffc0129be000 x0 : ffffff87aad60080
Call trace:
__memcpy+0x114/0x180
dwc3_interrupt+0x24/0x34

Bug: 426103040
Change-Id: I1de2ce53124a9df00fa29423f343003fd8c917e2
Signed-off-by: Frode Isaksen <frode@meta.com>
Fixes: 72246da40f37 ("usb: Introduce DesignWare USB3 DRD Driver")
Cc: stable <stable@kernel.org>
Acked-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/20250403072907.448524-1-fisaksen@baylibre.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Muhammed Ali <muhammed.ali@samsung.com>