Most callers have their own checks, but something like this should also
be checked centrally. As it happens, x-blockdev-create can pass negative
image sizes to format drivers (because there is no QAPI type that would
reject negative numbers) and triggers the check added by this patch.
Signed-off-by: Kevin Wolf <kw...@redhat.com>
Reviewed-by: Max Reitz <mre...@redhat.com>
---
block.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/block.c b/block.c
index 4a7e448226..5c874aefa1 100644
--- a/block.c
+++ b/block.c
@@ -3684,6 +3684,11 @@ int bdrv_truncate(BdrvChild *child, int64_t offset,
PreallocMode prealloc,
error_setg(errp, "No medium inserted");
return -ENOMEDIUM;
}
+ if (offset < 0) {
+ error_setg(errp, "Image size cannot be negative");
+ return -EINVAL;
+ }
+
if (!drv->bdrv_truncate) {
if (bs->file && drv->is_filter) {
return bdrv_truncate(bs->file, offset, prealloc, errp);
--
2.13.6
