Reacting to this:
Title: general protection fault in flexcop_usb_probe
Last occurred: 0 days ago
Reported: 102 days ago
Branches: Mainline (with usb-fuzzer patches)
Dashboard link: https://syzkaller.appspot.com/bug?id=c0203bd72037d0
7493f4b7562411e4f5f4553a8f
Original thread: https://lkml.kernel.org/lkml/00000000000010fe260586
[email protected]/T/#u
This bug has a C reproducer.
No one replied to the original thread for this bug.
This looks like a bug in a media USB driver.
If you fix this bug, please add the following tag to the commit:
Reported-by: [email protected]
#syz test: https://github.com/google/kasan.git usb-fuzzer-usb-testing-2019.07.11
>From 5a34ecc6c75479a9f245a867e1ce37e6e28f58f8 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <[email protected]>
Date: Mon, 29 Jul 2019 16:21:11 +0200
Subject: [PATCH] b2c2-flexcop-usb: add sanity checking
The driver needs an isochronous endpoint to be present. It will
oops in its absence. Add checking for it.
Reported-by: [email protected]
Signed-off-by: Oliver Neukum <[email protected]>
---
drivers/media/usb/b2c2/flexcop-usb.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/media/usb/b2c2/flexcop-usb.c
b/drivers/media/usb/b2c2/flexcop-usb.c
index 1826ff825c2e..1a801dc286f8 100644
--- a/drivers/media/usb/b2c2/flexcop-usb.c
+++ b/drivers/media/usb/b2c2/flexcop-usb.c
@@ -538,6 +538,9 @@ static int flexcop_usb_probe(struct usb_interface *intf,
struct flexcop_device *fc = NULL;
int ret;
+ if (intf->cur_altsetting->desc.bNumEndpoints < 1)
+ return -ENODEV;
+
if ((fc = flexcop_device_kmalloc(sizeof(struct flexcop_usb))) == NULL) {
err("out of memory\n");
return -ENOMEM;
--
2.16.4
