Make bdrv_get_full_backing_filename_from_filename() return an allocated string instead of placing the result in a caller-provided buffer.
Signed-off-by: Max Reitz <mre...@redhat.com> --- block.c | 32 +++++++++++++++++++------------- block/vmdk.c | 8 +++----- include/block/block.h | 7 +++---- 3 files changed, 25 insertions(+), 22 deletions(-) diff --git a/block.c b/block.c index 41f3c92..a12b1d3 100644 --- a/block.c +++ b/block.c @@ -201,20 +201,20 @@ static void path_combine_deprecated(char *dest, int dest_size, g_free(combined); } -void bdrv_get_full_backing_filename_from_filename(const char *backed, - const char *backing, - char *dest, size_t sz, - Error **errp) +char *bdrv_get_full_backing_filename_from_filename(const char *backed, + const char *backing, + Error **errp) { if (backing[0] == '\0' || path_has_protocol(backing) || path_is_absolute(backing)) { - pstrcpy(dest, sz, backing); + return g_strdup(backing); } else if (backed[0] == '\0' || strstart(backed, "json:", NULL)) { error_setg(errp, "Cannot use relative backing file names for '%s'", backed); + return NULL; } else { - path_combine_deprecated(dest, sz, backed, backing); + return path_combine(backed, backing); } } @@ -222,9 +222,15 @@ void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz, Error **errp) { char *backed = bs->exact_filename[0] ? bs->exact_filename : bs->filename; + char *full_name; - bdrv_get_full_backing_filename_from_filename(backed, bs->backing_file, - dest, sz, errp); + full_name = bdrv_get_full_backing_filename_from_filename(backed, + bs->backing_file, + errp); + if (full_name) { + pstrcpy(dest, sz, full_name); + g_free(full_name); + } } void bdrv_register(BlockDriver *bdrv) @@ -3551,16 +3557,16 @@ void bdrv_img_create(const char *filename, const char *fmt, if (size == -1) { if (backing_file) { BlockDriverState *bs; - char *full_backing = g_new0(char, PATH_MAX); + char *full_backing; int64_t size; int back_flags; QDict *backing_options = NULL; - bdrv_get_full_backing_filename_from_filename(filename, backing_file, - full_backing, PATH_MAX, - &local_err); + full_backing = + bdrv_get_full_backing_filename_from_filename(filename, + backing_file, + &local_err); if (local_err) { - g_free(full_backing); goto out; } diff --git a/block/vmdk.c b/block/vmdk.c index 142de20..58fe380 100644 --- a/block/vmdk.c +++ b/block/vmdk.c @@ -1934,12 +1934,10 @@ static int vmdk_create(const char *filename, QemuOpts *opts, Error **errp) } if (backing_file) { BlockBackend *blk; - char *full_backing = g_new0(char, PATH_MAX); - bdrv_get_full_backing_filename_from_filename(filename, backing_file, - full_backing, PATH_MAX, - &local_err); + char *full_backing = + bdrv_get_full_backing_filename_from_filename(filename, backing_file, + &local_err); if (local_err) { - g_free(full_backing); error_propagate(errp, local_err); ret = -ENOENT; goto exit; diff --git a/include/block/block.h b/include/block/block.h index 4604465..c6c00dd 100644 --- a/include/block/block.h +++ b/include/block/block.h @@ -435,10 +435,9 @@ void bdrv_get_backing_filename(BlockDriverState *bs, char *filename, int filename_size); void bdrv_get_full_backing_filename(BlockDriverState *bs, char *dest, size_t sz, Error **errp); -void bdrv_get_full_backing_filename_from_filename(const char *backed, - const char *backing, - char *dest, size_t sz, - Error **errp); +char *bdrv_get_full_backing_filename_from_filename(const char *backed, + const char *backing, + Error **errp); int bdrv_is_snapshot(BlockDriverState *bs); int path_has_protocol(const char *path); -- 2.8.0