On 08/06/2015 04:52 AM, Max Reitz wrote:
> Instead of returning a pointer to the filename, copy it into a buffer
> specified by the caller.
>
> Signed-off-by: Max Reitz <mre...@redhat.com>
> ---
> block.c | 24 +++++++++++++++++-------
> include/block/block.h | 2 +-
> monitor.c | 4 +++-
> 3 files changed, 21 insertions(+), 9 deletions(-)
>
> diff --git a/block.c b/block.c
> index d088ee0..e7dd2f1 100644
> --- a/block.c
> +++ b/block.c
> @@ -2760,10 +2760,12 @@ void bdrv_add_key(BlockDriverState *bs, const char
> *key, Error **errp)
> }
> } else {
> if (bdrv_key_required(bs)) {
> + char enc_filename[PATH_MAX];
I think it's better to use g_malloc() here.
> + bdrv_get_encrypted_filename(bs, enc_filename,
> sizeof(enc_filename));
> error_set(errp, ERROR_CLASS_DEVICE_ENCRYPTED,
> "'%s' (%s) is encrypted",
> bdrv_get_device_or_node_name(bs),
> - bdrv_get_encrypted_filename(bs));
> + enc_filename);
> }
> }
> }
> @@ -2980,14 +2982,22 @@ bool
> bdrv_can_write_zeroes_with_unmap(BlockDriverState *bs)
> return false;
> }
>
> -const char *bdrv_get_encrypted_filename(BlockDriverState *bs)
> +char *bdrv_get_encrypted_filename(BlockDriverState *bs, char *dest, size_t
> sz)
> {
> - if (bs->backing_hd && bs->backing_hd->encrypted)
> - return bs->backing_file;
> - else if (bs->encrypted)
> - return bs->filename;
> - else
> + if (sz > INT_MAX) {
> + sz = INT_MAX;
> + }
> +
> + if (bs->backing_hd && bs->backing_hd->encrypted) {
> + pstrcpy(dest, sz, bs->backing_file);
> + return dest;
> + } else if (bs->encrypted) {
> + pstrcpy(dest, sz, bs->filename);
> + return dest;
> + } else {
> + dest[0] = '\0';
> return NULL;
> + }
> }
>
> void bdrv_get_backing_filename(BlockDriverState *bs,
> diff --git a/include/block/block.h b/include/block/block.h
> index 37916f7..a78e4f1 100644
> --- a/include/block/block.h
> +++ b/include/block/block.h
> @@ -430,7 +430,7 @@ void bdrv_round_to_clusters(BlockDriverState *bs,
> int64_t *cluster_sector_num,
> int *cluster_nb_sectors);
>
> -const char *bdrv_get_encrypted_filename(BlockDriverState *bs);
> +char *bdrv_get_encrypted_filename(BlockDriverState *bs, char *dest, size_t
> sz);
> void bdrv_get_backing_filename(BlockDriverState *bs,
> char *filename, int filename_size);
> void bdrv_get_full_backing_filename(BlockDriverState *bs,
> diff --git a/monitor.c b/monitor.c
> index aeea2b5..cfdf781 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -5292,10 +5292,12 @@ int monitor_read_bdrv_key_start(Monitor *mon,
> BlockDriverState *bs,
> BlockCompletionFunc *completion_cb,
> void *opaque)
> {
> + char enc_filename[PATH_MAX];
same too.
Thanks
Wen Congyang
> int err;
>
> + bdrv_get_encrypted_filename(bs, enc_filename, sizeof(enc_filename));
> monitor_printf(mon, "%s (%s) is encrypted.\n", bdrv_get_device_name(bs),
> - bdrv_get_encrypted_filename(bs));
> + enc_filename);
>
> mon->password_completion_cb = completion_cb;
> mon->password_opaque = opaque;
>
