ping
On Wed, Mar 26, 2025, 18:20 donno2048 <just4now666...@gmail.com> wrote:
> This silently fixes issues resulting from trying to allocate 0 bytes.
>
> Fixes error, for example, for writing byte 0x20 to port 0x3c0, then word
> 0xf09 to port 0x3b4 when CPU is initiated, which shouldn't break.
>
> Signed-off-by: donno2048 <just4now666...@gmail.com>
> ---
> util/memfd.c | 10 +++++++---
> 1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/util/memfd.c b/util/memfd.c
> index 07beab174d..4f2c4ea1dd 100644
> --- a/util/memfd.c
> +++ b/util/memfd.c
> @@ -131,9 +131,13 @@ void *qemu_memfd_alloc(const char *name, size_t size,
> unsigned int seals,
> }
> }
>
> - ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
> - if (ptr == MAP_FAILED) {
> - goto err;
> + if (size != 0) {
> + ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
> + if (ptr == MAP_FAILED) {
> + goto err;
> + }
> + } else {
> + ptr = fdopen(mfd, "rw");
> }
>
> *fd = mfd;
> --
> 2.30.2
>
>
