Module Name:    src
Committed By:   maya
Date:           Thu Oct 31 11:59:40 UTC 2019

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

Log Message:
check if buf/bufsz are non-NULL before freeing.

not all control messages that can be received result in buf being
initialized, we might get a spurious different control message

seen in practice when swapping modes a few times on a urndis device

urndis0: SAMSUNG ...
autoconfiguration error: urndis0: invalid address
panic: kernel diagnostic assertion "p != NULL" failed: file 
"/cvs/src/sys/kern/subr_kmem.c", line 263
cpu0: Begin traceback...
vpanic() at netbsd:vpanic+0x178
kern_assert() at netbsd:kern_assert+0x48
kmem_intr_free() at netbsd:kmem_intr_free+0xca
urndis_attach() at netbsd:urndis_attach+0x4c2

To generate a diff of this commit:
cvs rdiff -u -r1.33 -r1.34 src/sys/dev/usb/if_urndis.c

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

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