[PATCH 0/4] net: avoid variable length arrays

[Peter Maydell <peter.maydell@linaro.org>]

This patchset removes the use of variable length arrays in a couple
of network devices and the net/ core code.  In one case we can switch
to a fixed-sized array on the stack; in the other three we have to
use a heap allocation.

The codebase has very few VLAs, and if we can get rid of them all we
can make the compiler error on new additions.  This is a defensive
measure against security bugs where an on-stack dynamic allocation
isn't correctly size-checked (e.g.  CVE-2021-3527).

Philippe had a go at these in  a patch in 2021:
https://patchew.org/QEMU/20210505211047.1496765-1-philmd@redhat.com/20210505211047.1496765-16-philmd@redhat.com/
but these are re-implementations, mostly.

Usual disclaimer: I have tested these patches only with
"make check" and "make check-avocado".

thanks
-- PMM

Peter Maydell (4):
  hw/net/fsl_etsec/rings.c: Avoid variable length array
  hw/net/rocker: Avoid variable length array
  net/dump: Avoid variable length array
  net/tap: Avoid variable-length array

 hw/net/fsl_etsec/rings.c      | 12 ++++++++++--
 hw/net/rocker/rocker_of_dpa.c |  2 +-
 net/dump.c                    |  2 +-
 net/tap.c                     |  3 ++-
 4 files changed, 14 insertions(+), 5 deletions(-)

-- 
2.34.1