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Re: [Qemu-block] [PATCH] block/vhdx: Don't take address of fields in pac
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-block] [PATCH] block/vhdx: Don't take address of fields in packed structs |
Date: |
Wed, 17 Oct 2018 10:32:47 +0100 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
On Tue, Oct 16, 2018 at 06:09:38PM +0100, Peter Maydell wrote:
> Taking the address of a field in a packed struct is a bad idea, because
> it might not be actually aligned enough for that pointer type (and
> thus cause a crash on dereference on some host architectures). Newer
> versions of clang warn about this. Avoid the bug by not using the
> "modify in place" byte swapping functions.
>
> There are a few places where the in-place swap function is
> used on something other than a packed struct field; we convert
> those anyway, for consistency.
>
> Patch produced with scripts/coccinelle/inplace-byteswaps.cocci.
>
> Signed-off-by: Peter Maydell <address@hidden>
> ---
> Usual disclaimer: produced with "make check" only, but purely
> automated conversion should be safe.
>
> block/vhdx.h | 12 ++---
> block/vhdx-endian.c | 118 ++++++++++++++++++++++----------------------
> block/vhdx-log.c | 4 +-
> block/vhdx.c | 18 +++----
> 4 files changed, 76 insertions(+), 76 deletions(-)
Reviewed-by: Stefan Hajnoczi <address@hidden>
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