CVS commit: src/sys/rump/librump/rumpkern

["Kamil Rytarowski" <kamil%netbsd.org@localhost>]

Module Name:    src
Committed By:   kamil
Date:           Sun Apr  5 15:16:11 UTC 2020

Modified Files:
        src/sys/rump/librump/rumpkern: rumpcopy.c

Log Message:
Return early on 0-sized transfers (usually to/from NULL-objects)

This logic is already present in subr_copy.c:copyin_vmspace() and
rumpcopy.c:copyinstr().

This avoids memcpy() calls for NULL objects that is Undefined Behavior,
allowed in the kernel space (-fno-delete-null-pointer-checks), but not
in userland.

Reported by UBSan.


To generate a diff of this commit:
cvs rdiff -u -r1.23 -r1.24 src/sys/rump/librump/rumpkern/rumpcopy.c

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