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-rw-r--r--block.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/block.c b/block.c
index a48b30c249..0c14eee31c 100644
--- a/block.c
+++ b/block.c
@@ -2764,7 +2764,7 @@ int bdrv_img_create(const char *filename, const char *fmt,
char *options, uint64_t img_size, int flags)
{
QEMUOptionParameter *param = NULL, *create_options = NULL;
- QEMUOptionParameter *backing_fmt;
+ QEMUOptionParameter *backing_fmt, *backing_file;
BlockDriverState *bs = NULL;
BlockDriver *drv, *proto_drv;
int ret = 0;
@@ -2823,6 +2823,16 @@ int bdrv_img_create(const char *filename, const char *fmt,
}
}
+ backing_file = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
+ if (backing_file && backing_file->value.s) {
+ if (!strcmp(filename, backing_file->value.s)) {
+ error_report("Error: Trying to create an image with the "
+ "same filename as the backing file");
+ ret = -1;
+ goto out;
+ }
+ }
+
backing_fmt = get_option_parameter(param, BLOCK_OPT_BACKING_FMT);
if (backing_fmt && backing_fmt->value.s) {
if (!bdrv_find_format(backing_fmt->value.s)) {
@@ -2836,9 +2846,6 @@ int bdrv_img_create(const char *filename, const char *fmt,
// The size for the image must always be specified, with one exception:
// If we are using a backing file, we can obtain the size from there
if (get_option_parameter(param, BLOCK_OPT_SIZE)->value.n == -1) {
- QEMUOptionParameter *backing_file =
- get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
-
if (backing_file && backing_file->value.s) {
uint64_t size;
const char *fmt = NULL;