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block: Fail bdrv_truncate() with negative size

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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 <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Kevin Wolf 2018-02-07 17:58:47 +01:00
parent 89b259eeaa
commit cd8b7aaa07
1 changed files with 5 additions and 0 deletions
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5
block.c
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@ -3719,6 +3719,11 @@ 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);