CVS commit: src/sys/dev/usb

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

Module Name:    src
Committed By:   riastradh
Date:           Sat Mar 19 20:50:32 UTC 2022

Modified Files:
        src/sys/dev/usb: usb_subr.c

Log Message:
usb: Insert assertion to diagnose ud_cdesc/ud_ifaces inconsistency.

Syzbot found a way to see ud_cdesc=NULL but ud_ifaces!=NULL:

https://syzkaller.appspot.com/bug?id=e6d4449a128e73a9a88100a5cc833e5cae9fecae

Maybe it's a race with two threads somehow doing usbd_free_device at
the same time when only one should, but let's rule this case out
early on to make it easier to prove it has to be a race.


To generate a diff of this commit:
cvs rdiff -u -r1.274 -r1.275 src/sys/dev/usb/usb_subr.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.