From: Max Reitz <mre...@redhat.com> We reject backing file names with a length of more than 1023 characters when opening a qcow2 file, so we should not produce such files ourselves.
Cc: qemu-sta...@nongnu.org Signed-off-by: Max Reitz <mre...@redhat.com> Signed-off-by: Kevin Wolf <kw...@redhat.com> --- block/qcow2.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/block/qcow2.c b/block/qcow2.c index 056525c..470734b 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -1986,6 +1986,10 @@ static int qcow2_change_backing_file(BlockDriverState *bs, { BDRVQcow2State *s = bs->opaque; + if (backing_file && strlen(backing_file) > 1023) { + return -EINVAL; + } + pstrcpy(bs->backing_file, sizeof(bs->backing_file), backing_file ?: ""); pstrcpy(bs->backing_format, sizeof(bs->backing_format), backing_fmt ?: ""); -- 1.8.3.1