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Dismiss alert {{ message }} gregkh / linux Public Notifications You must be signed in to change notification settings Fork 676 Star 636 Code Actions Security and quality 0 Insights Additional navigation options Code Actions Security and quality Insights Commit a730feb Browse files Browse files AlanStern authored and gregkh committed USB: sisusbvga: Add endpoint checks commit df05a9b upstream. The syzbot fuzzer was able to provoke a WARNING from the sisusbvga driver: ------------[ cut here ]------------ usb 1-1: BOGUS urb xfer, pipe 3 != type 1 WARNING: CPU: 1 PID: 26 at drivers/usb/core/urb.c:504 usb_submit_urb+0xed6/0x1880 drivers/usb/core/urb.c:504 Modules linked in: CPU: 1 PID: 26 Comm: kworker/1:1 Not tainted 6.2.0-rc5-syzkaller-00199-g5af6ce704936 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Workqueue: usb_hub_wq hub_event RIP: 0010:usb_submit_urb+0xed6/0x1880 drivers/usb/core/urb.c:504 Code: 7c 24 18 e8 6c 50 80 fb 48 8b 7c 24 18 e8 62 1a 01 ff 41 89 d8 44 89 e1 4c 89 ea 48 89 c6 48 c7 c7 60 b1 fa 8a e8 84 b0 be 03 &lt;0f&gt; 0b e9 58 f8 ff ff e8 3e 50 80 fb 48 81 c5 c0 05 00 00 e9 84 f7 RSP: 0018:ffffc90000a1ed18 EFLAGS: 00010282 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000 RDX: ffff888012783a80 RSI: ffffffff816680ec RDI: fffff52000143d95 RBP: ffff888079020000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000080000000 R11: 0000000000000000 R12: 0000000000000003 R13: ffff888017d33370 R14: 0000000000000003 R15: ffff888021213600 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005592753a60b0 CR3: 0000000022899000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: &lt;TASK&gt; sisusb_bulkout_msg drivers/usb/misc/sisusbvga/sisusbvga.c:224 [inline] sisusb_send_bulk_msg.constprop.0+0x904/0x1230 drivers/usb/misc/sisusbvga/sisusbvga.c:379 sisusb_send_bridge_packet drivers/usb/misc/sisusbvga/sisusbvga.c:567 [inline] sisusb_do_init_gfxdevice drivers/usb/misc/sisusbvga/sisusbvga.c:2077 [inline] sisusb_init_gfxdevice+0x87b/0x4000 drivers/usb/misc/sisusbvga/sisusbvga.c:2177 sisusb_probe+0x9cd/0xbe2 drivers/usb/misc/sisusbvga/sisusbvga.c:2869 ... The problem was caused by the fact that the driver does not check whether the endpoints it uses are actually present and have the appropriate types. This can be fixed by adding a simple check of the endpoints. Link: https://syzkaller.appspot.com/bug?extid=23be03b56c5259385d79 Reported-and-tested-by: syzbot+23be03b56c5259385d79@syzkaller.appspotmail.com Signed-off-by: Alan Stern &lt;stern@rowland.harvard.edu&gt; Link: https://lore.kernel.org/r/48ef98f7-51ae-4f63-b8d3-0ef2004bb60a@rowland.harvard.edu Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt; Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt; 1 parent 80100e0 commit a730feb Copy full SHA for a730feb 1 file changed + 14 Lines changed: 14 additions &amp; 0 deletions File tree Expand file tree Collapse file tree Open diff view settings Filter options drivers/usb/misc/sisusbvga sisusb.c Expand file tree Collapse file tree Open diff view settings Collapse file ‎ drivers/usb/misc/sisusbvga/sisusb.c ‎ Copy file name to clipboard Expand all lines: drivers/usb/misc/sisusbvga/sisusb.c + 14 Lines changed: 14 additions &amp; 0 deletions Original file line number Diff line number Diff line change @@ -3014,6 +3014,20 @@ static int sisusb_probe(struct usb_interface *intf, 3014 3014 struct usb_device * dev = interface_to_usbdev ( intf ); 3015 3015 struct sisusb_usb_data * sisusb ; 3016 3016 int retval = 0 , i ; 3017 + static const u8 ep_addresses [] = { 3018 + SISUSB_EP_GFX_IN | USB_DIR_IN , 3019 + SISUSB_EP_GFX_OUT | USB_DIR_OUT , 3020 + SISUSB_EP_GFX_BULK_OUT | USB_DIR_OUT , 3021 + SISUSB_EP_GFX_LBULK_OUT | USB_DIR_OUT , 3022 + SISUSB_EP_BRIDGE_IN | USB_DIR_IN , 3023 + SISUSB_EP_BRIDGE_OUT | USB_DIR_OUT , 3024 + 0 }; 3025 + 3026 + /* Are the expected endpoints present? */ 3027 + if (! usb_check_bulk_endpoints ( intf , ep_addresses )) { 3028 + dev_err ( &amp; intf -&gt; dev , &quot;Invalid USB2VGA device\n&quot; ); 3029 + return - EINVAL ; 3030 + } 3017 3031 3018 3032 dev_info ( &amp; dev -&gt; dev , &quot;USB2VGA dongle found at address %d\n&quot; , 3019 3033 dev -&gt; devnum ); 0 commit comments Comments 0 ( 0 ) Footer &copy; 2026 GitHub,&nbsp;Inc. 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