linux-kernel - [PATCH AUTOSEL for 4.9 06/54] usb: gadget: f_fs: Fix ExtCompat descriptor validation

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Message-ID: <20171122222344.19782-6-alexander.levin@verizon.com>
Date:   Wed, 22 Nov 2017 22:23:52 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Vincent Pelletier <plr.vincent@...il.com>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.9 06/54] usb: gadget: f_fs: Fix ExtCompat
 descriptor validation

From: Vincent Pelletier <plr.vincent@...il.com>

[ Upstream commit 354bc45bf329494ef6051f3229ef50b9e2a7ea2a ]

Reserved1 is documented as expected to be set to 0, but this test fails
when it it set to 0. Reverse the condition.

Signed-off-by: Vincent Pelletier <plr.vincent@...il.com>
Signed-off-by: Felipe Balbi <felipe.balbi@...ux.intel.com>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/usb/gadget/function/f_fs.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 273320fa30ae..4fce83266926 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2263,7 +2263,7 @@ static int __ffs_data_do_os_desc(enum ffs_os_desc_type type,
 
 		if (len < sizeof(*d) ||
 		    d->bFirstInterfaceNumber >= ffs->interfaces_count ||
-		    !d->Reserved1)
+		    d->Reserved1)
 			return -EINVAL;
 		for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i)
 			if (d->Reserved2[i])
-- 
2.11.0